GitHub Actions: CI to check PHP Notice

[yookoala]

Description

• CI to check and output all php "Notice" in server_log generated in test. More hint to improve code with.
• Allow the step to fail at the moment. Only provide verbose hint but not enforcing developer to clear all notices.

Motivation and Context Sometimes changes in code would generate notice that are expose incorrect assumption and hence potential problem, for example:

(from: https://github.com/GibbonEdu/core/actions/runs/7955085821)

Extracting and showing verbose log about it can provide vital hints for code improvements.

How Has This Been Tested?

Tested the base script locally against the log with notice:

[yookoala]

@SKuipers: The GitHub Action for CI Test will now show a new "Check PHP notice in server_log" section that will have the log message extracted. But currently the step will be skipped if the test failed. Need one more update to have it visible.

See #1790.