Only update .build-agent.yaml if Agent release branch is created

[Kyle-Neale]

What does this PR do?

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

❌ Patch coverage is 91.52542% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.99%. Comparing base (f423491) to head (01c4910).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

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[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

❄️ 1 New flaky test detected

test_statement_metrics_and_plans[master-EXEC encryptedProc-expected_queries_patterns2-param_groups2-5-True-True-True-False-encryptedproc] from test_statements.py (Datadog) (Fix with Cursor)

missing expected matching rows
assert 0 == 1
 +  where 0 = len([])
 +  and   1 = len([''])

ℹ️ Info

🧪 All tests passed

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