Deprioritize CancelOutstandingWorkerPolls in matching rate limiter (#10010)

## What
Move `CancelOutstandingWorkerPolls` from priority 1 to priority 2 in the
matching service rate limiter, and add priority level 2 to
`APIPrioritiesOrdered`.

## Why
`CancelOutstandingWorkerPolls` fans out to `numPartitions ×
numTaskTypes` RPCs per worker shutdown. Under concurrent worker
shutdowns, this burst competes with Poll and AddTask RPCs (both priority
1) for the matching rate limiter budget. When the limiter is exhausted,
`ForwardPoll` and `ForwardTask` between partitions fail, causing tasks
to be stuck for up to 60s (the long-poll timeout). Deprioritizing cancel
RPCs ensures task-critical RPCs are served first under pressure.

## How did you test it?
Reproduced the issue by running SDK Core integration tests against a
local dev server with `enableCancelWorkerPollsOnShutdown` enabled.
Before the fix: 3/5 iterations had 60s+ stalls with 340
`ResourceExhausted` errors. After the fix: 15/15 iterations passed
cleanly (6-7s each) with 0 `ResourceExhausted` errors at default 1200
RPS.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: rkannan82

service/matching/configs/quotas.go

@@ -16,7 +16,7 @@ var (
 		"/temporal.server.api.matchingservice.v1.MatchingService/AddActivityTask":                        1,
 		"/temporal.server.api.matchingservice.v1.MatchingService/AddWorkflowTask":                        1,
 		"/temporal.server.api.matchingservice.v1.MatchingService/CancelOutstandingPoll":                  1,
-		"/temporal.server.api.matchingservice.v1.MatchingService/CancelOutstandingWorkerPolls":           1,
+		"/temporal.server.api.matchingservice.v1.MatchingService/CancelOutstandingWorkerPolls":           2,
 		"/temporal.server.api.matchingservice.v1.MatchingService/DescribeTaskQueue":                      1,
 		"/temporal.server.api.matchingservice.v1.MatchingService/ListTaskQueuePartitions":                1,
 		"/temporal.server.api.matchingservice.v1.MatchingService/PollActivityTaskQueue":                  1,
@@ -55,7 +55,7 @@ var (
 		"/temporal.server.api.matchingservice.v1.MatchingService/CheckTaskQueueVersionMembership":        1,
 	}
 
-	APIPrioritiesOrdered = []int{0, 1}
+	APIPrioritiesOrdered = []int{0, 1, 2}
 )
 
 func NewPriorityRateLimiter(