chore: fix transient random test failures

[paulbalandan]

Description
Random tests still fails at some points. Trying to probe the likely culprit.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

The fix here is to acknowledge the fact that the transient failures may be caused by race issues within GitHub Actions. Thus, the script will retry for another round with a fresh random seed. Given that the failures all revolve around CodeIgniter\CodeIgniter not found or failed to autoload, I disabled opcache in CLI as a primary defense and the retry as fallback.

The retry mechanism absorbed the flaky test fails in Language and Log in the SQLSRV matrix.