[fix]: drop release/** from build-and-test push triggers

Replaces the earlier concurrency-key split. release-branch commits
(e.g. the CHANGELOG date finalize step in release-workflow.yml) were
firing build-and-test from both push:release/** and
pull_request:synchronize, and the two runs cancelled each other.

Removing release/** from the push triggers leaves only the
pull_request:synchronize path, so each commit produces exactly one
build-and-test run on the release PR. The release-workflow.yml stays
unchanged — the CHANGELOG commit is still made on the release branch
so the merge into main is atomic, and gh pr checks --watch sees the
single synchronize-triggered run.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: sf-tyler-jeong

.github/workflows/build-and-test.yml

@@ -7,9 +7,8 @@ on:
   push:
     branches:
       - main
-      - release/**
 concurrency:
-  group: build-and-test-${{ github.event_name }}-${{ github.head_ref || github.ref_name }}
+  group: build-and-test-${{ github.head_ref || github.ref_name }}
   cancel-in-progress: true
 
 jobs: