Build/Test Tools: Remove unused reusable workflow.

The `reusable-performance.yml` workflow is no longer used in any branch, so it can be safely removed.

Props mukesh27.
Fixes #65380.

git-svn-id: https://develop.svn.wordpress.org/trunk@62445 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/performance.yml

@@ -37,7 +37,6 @@ on:
       - 'tests/performance/**'
       # Confirm any changes to relevant workflow files.
       - '.github/workflows/performance.yml'
-      - '.github/workflows/reusable-performance.yml'
       - '.github/workflows/reusable-performance-*.yml'
   workflow_dispatch: