feat(agent): add support for CakePHP 4.x and 5.x

[hahuja2]

This PR does the following:

• Modifies how the action name is retrieved, so that it is compatible with CakePHP 4.x and 5.x
• Adds correct detection file for CakePHP 4.x and 5.x
• Adds call to nr_txn_suggest_package_supportability_metric in nr_cakephp_enable

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	7/7 passing
SOAK	❌	54/56 passing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 11.42857% with 31 lines in your changes missing coverage. Please review.

Project coverage is 78.68%. Comparing base (727812d) to head (6540e70).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
agent/fw_cakephp.c	11.42%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #983      +/-   ##
==========================================
+ Coverage   78.54%   78.68%   +0.14%     
==========================================
  Files         196      196              
  Lines       27103    27047      -56     
==========================================
- Hits        21287    21281       -6     
+ Misses       5816     5766      -50     

Flag	Coverage Δ
agent-for-php-7.2	78.69% <11.42%> (+0.14%)	⬆️
agent-for-php-7.3	78.71% <11.42%> (+0.14%)	⬆️
agent-for-php-7.4	78.41% <11.42%> (+0.14%)	⬆️
agent-for-php-8.0	78.43% <11.42%> (+0.14%)	⬆️
agent-for-php-8.1	78.42% <11.42%> (+0.14%)	⬆️
agent-for-php-8.2	78.01% <11.42%> (+0.14%)	⬆️
agent-for-php-8.3	78.01% <11.42%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[lavarou]

I'm not sure this is needed. When Observer API is used to hook into Zend Engine, the agent should do the right thing and record the error on the transaction even though framework installs its own exception handler. See Yii's exception instrumentation here for reference.

[hahuja2]

I have experimented with the above and noticed that the error is not recorded as a traced error. Instead, I have added code that retrieves the exception caught by CakePHP's error handler and reports it as a traced error: 86108b5

[lavarou]

Leaving information for posterity:

• CakePHP 4.x Error & Exception Handling
• CakePHP 5.x Error & Exception Handling

The agent correctly detects that CakePHP registers its default exception handler Cake\Error\ExceptionTrap::handleException (CakePHP 4.x, CakePHP 5.x). However, that exception handler is used only for uncaught exceptions. In a CakePHP application, exceptions thrown in controller actions are caught in Cake\Error\Middleware\ErrorHandlerMiddleware::process method (CakePHP 4.x, CakePHP 5.x). Cake\Error\Middleware\ErrorHandlerMiddleware is part of CakePHP application's default middleware stack (CakePHP 4.x, CakePHP 5.x) so wrapping Cake\Error\Middleware\ErrorHandlerMiddleware::handleException is the right approach for the agent to record error events for exceptions thrown by controller actions in standard CakePHP applications.