Closes #67: Only rename debug.log with errors relating to WPR

[jeawhanlee]

Description

Fixes #67
Only renames debug.log files that contain wp rocket related errors.

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

Run tests on debug.log and if a debug.log file is generated during the test run, e2e will automatically rename this log file thereby associating it to the scenario that triggered the creation even if it does not contain errors related to WP Rocket.

Technical description

Documentation

With this new implementation, the file is being read from the server and matched against patterns that could found when a WP Rocket error is generated.

New dependencies

N/A

Risks

N/A

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

Unticked items justification

• This is already a test, I did not implement built-in test.
• There are no entry points

[Mai-Saad]

Debug file won't be renamed now unless it have WP_Rocket or /plugins/wp-rocket/

(attached smoke test results and before/after PR for log files)