feat(posts): support scheduling all post types

[idoshamun]

Summary:

• Add scheduledAt support to one-source sharePost, submitExternalLink, and createPollPost flows.
• Reuse existing scheduled-post flags/Temporal publish flow while keeping moderation and createPostInMultipleSources scheduling unsupported.
• List all scheduled post types in scheduledPosts and add regression coverage for share, external link, poll, scheduled listing, and content-update workers preserving scheduled shares.
• Guard postUpdated worker visibility updates so scheduled posts/shares are not published before Temporal.

Validation:

• pnpm exec prettier --write src/common/post.ts src/entity/posts/utils.ts src/schema/posts.ts src/entity/SourcePostModeration.ts tests/posts.ts src/workers/postUpdated/shared.ts tests/workers/postUpdated.ts
• NODE_ENV=test npx jest tests/posts.ts --testEnvironment=node --runInBand -t "should throw error when content exceeds maximum length|should return link preview and image being the placeholder when empty|should return an error if content exceeds 20000 characters|should schedule shared post|should create invisible share and still return mutation result|should schedule createPollPost|should schedule external link share|should list scheduled posts"
• NODE_ENV=test npx jest tests/workers/postUpdated.ts --testEnvironment=node --runInBand -t "should update all the post related shared posts to visible|should not update scheduled shared posts to visible"
• pnpm run build
• pnpm run lint

[pulumi]

🍹 The Update (preview) for dailydotdev/api/prod (at ec0301c) was successful.

Resource Changes

    Name                                                       Type                           Operation
+   vpc-native-api-db-migration-1c3d2237                       kubernetes:batch/v1:Job        create
~   vpc-native-calculate-top-readers-cron                      kubernetes:batch/v1:CronJob    update
-   vpc-native-api-clickhouse-migration-fcab9478               kubernetes:batch/v1:Job        delete
~   vpc-native-ws-deployment                                   kubernetes:apps/v1:Deployment  update
~   vpc-native-clean-old-notifications-cron                    kubernetes:batch/v1:CronJob    update
~   vpc-native-squad-posts-analytics-refresh-cron              kubernetes:batch/v1:CronJob    update
~   vpc-native-clean-gifted-plus-cron                          kubernetes:batch/v1:CronJob    update
~   vpc-native-temporal-deployment                             kubernetes:apps/v1:Deployment  update
~   vpc-native-user-posts-analytics-refresh-cron               kubernetes:batch/v1:CronJob    update
~   vpc-native-daily-digest-cron                               kubernetes:batch/v1:CronJob    update
~   vpc-native-materialize-monthly-best-post-archives-cron     kubernetes:batch/v1:CronJob    update
~   vpc-native-update-views-cron                               kubernetes:batch/v1:CronJob    update
~   vpc-native-post-lifecycle-state-clickhouse-cron            kubernetes:batch/v1:CronJob    update
~   vpc-native-personalized-digest-cron                        kubernetes:batch/v1:CronJob    update
~   vpc-native-channel-digests-cron                            kubernetes:batch/v1:CronJob    update
~   vpc-native-update-source-public-threshold-cron             kubernetes:batch/v1:CronJob    update
~   vpc-native-rotate-daily-quests-cron                        kubernetes:batch/v1:CronJob    update
~   vpc-native-subscription-anniversary-achievements-cron      kubernetes:batch/v1:CronJob    update
~   vpc-native-deployment                                      kubernetes:apps/v1:Deployment  update
~   vpc-native-channel-highlights-cron                         kubernetes:batch/v1:CronJob    update
~   vpc-native-user-profile-analytics-history-clickhouse-cron  kubernetes:batch/v1:CronJob    update
-   vpc-native-api-db-migration-fcab9478                       kubernetes:batch/v1:Job        delete
~   vpc-native-check-analytics-report-cron                     kubernetes:batch/v1:CronJob    update
~   vpc-native-update-trending-cron                            kubernetes:batch/v1:CronJob    update
~   vpc-native-update-tags-str-cron                            kubernetes:batch/v1:CronJob    update
~   vpc-native-user-profile-analytics-clickhouse-cron          kubernetes:batch/v1:CronJob    update
~   vpc-native-clean-zombie-opportunities-cron                 kubernetes:batch/v1:CronJob    update
~   vpc-native-generate-search-invites-cron                    kubernetes:batch/v1:CronJob    update
~   vpc-native-clean-zombie-images-cron                        kubernetes:batch/v1:CronJob    update
~   vpc-native-personalized-digest-deployment                  kubernetes:apps/v1:Deployment  update
~   vpc-native-sync-subscription-with-cio-cron                 kubernetes:batch/v1:CronJob    update
~   vpc-native-post-analytics-history-day-clickhouse-cron      kubernetes:batch/v1:CronJob    update
~   vpc-native-clean-channel-highlights-cron                   kubernetes:batch/v1:CronJob    update
~   vpc-native-private-deployment                              kubernetes:apps/v1:Deployment  update
~   vpc-native-rotate-weekly-quests-cron                       kubernetes:batch/v1:CronJob    update
~   vpc-native-hourly-notification-cron                        kubernetes:batch/v1:CronJob    update
~   vpc-native-post-analytics-achievements-cron                kubernetes:batch/v1:CronJob    update
~   vpc-native-clean-expired-better-auth-sessions-cron         kubernetes:batch/v1:CronJob    update
~   vpc-native-expire-super-agent-trial-cron                   kubernetes:batch/v1:CronJob    update
~   vpc-native-generic-referral-reminder-cron                  kubernetes:batch/v1:CronJob    update
~   vpc-native-user-profile-updated-sync-cron                  kubernetes:batch/v1:CronJob    update
... and 15 other changes