Changes

ci: fix workspace pvc rollout for ticdc latest jobs (#4513)

## Summary
- part of the workspace PVC rollout correction split from `ci#4512`
- switch this job subset to Jenkins kubernetes plugin `workspaceVolume
genericEphemeralVolume(...)`
- remove the ineffective pod-yaml `workspace-volume` blocks for the same
subset

## Why This PR Exists
The original follow-up PR `ci#4512` proved the right fix, but
`pull-replay-jenkins-pipelines` failed because that PR changed `111`
pipeline files and exceeded the replay gate limit:
- `ERROR: replay file count 111 exceeds --max-replays 20`

This split PR keeps the same validated fix while staying within the
replay gate bound.

## Scope
- changed pipeline files: `20`
- cleaned pod yaml files: `34`
- replay-safe split: yes (`<= 20` pipeline files)

## Validation
- each changed Jenkinsfile in this PR was validated via:
  - `https://prow.tidb.net/jenkins/pipeline-model-converter/validate`
- each changed pod yaml in this PR passed local YAML parsing
- root-cause evidence remains:
- replay pod manifest for `ci#4509` still showed `workspace-volume:
emptyDir`
-
https://prow.tidb.net/jenkins/job/pingcap/job/tidb/job/release-8.5/job/pull_build/30
 (commit: b14bd48)