refactor: improve skip stage detection, propagate context in downloader, and style log viewer

[Parthtiw710]

Description

This PR introduces performance optimizations, robustness improvements, and a UI enhancement to the log viewer:

1. Context Propagation in Binary Downloader: Updates DownloadBinary to accept a context.Context and use http.NewRequestWithContext, enabling proper timeouts and cancellation.
2. Optimized Skip Stage Check: Replaces cloning of the git repository with local directory lookup via targetDSP during stage skip checks, reducing network overhead and disk usage.
3. Detailed Status Reason Reporting: Adds statusReason support to reportStageStatus to report skip reasons and failure messages to the control plane.
4. Powerline-Style Log Viewer Header: Enhances the web log viewer component with a sleek, multi-segmented Powerline terminal prompt.

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Key Changes

⚙️ Piped & Launcher (Go)

• pkg/lifecycle/binary.go / pkg/lifecycle/binary_test.go:
  • Added ctx context.Context parameter to DownloadBinary.
  • Replaced http.NewRequest with http.NewRequestWithContext to inherit cancellation signals.
  • Updated callers in launcher.go, piped.go, and test assertions to propagate context.
• pkg/app/pipedv1/controller/scheduler.go:
  • Updated reportStageStatus signature to include statusReason.
  • Set the StatusReason field inside ReportStageStatusChangedRequest.
  • Cleaned up legacy commented-out script rollback stage logic.
• pkg/app/pipedv1/controller/skipstage.go:
  • Avoided calling gitClient.Clone inside determineSkipStage.
  • Retrieved local directory using s.targetDSP.Get(ctx, io.Discard) to instantiate the repository object directly, preventing redundant repository clones.

🎨 Web Frontend (TypeScript/React)

• web/src/components/deployments-detail-page/log-viewer/log/index.tsx:
  • Integrated useAuth hook to query the active user's identity.
  • Added a custom Powerline-themed terminal prompt (Username me?.subject, Directory ~, and File stage.log) constructed with Material UI Box and CSS clipPath polygons.
  • Increased vertical padding on the log container for better readability.

[Parthtiw710]

@eeshaanSA @rahulshendre @khanhtc1202 i have added the context which was written in todo instruction comments, please look the changes. in prev pr i replaced waitgroup to do as mentioned in todo instrucions, i am currently working on todo instructions left in comments.