Track usage ping event when the full code quality report component is mounted

What does this MR do?

See #276380 (closed) for more context

This MR adds a new usage ping event (i_testing_full_code_quality_report_total) that tracks the number of unique users per instance that view the full code quality report (aka the "Code Quality" tab of a pipeline).

Per the Usage Ping Guide, this MR adds a new feature flag (usage_data_i_testing_full_code_quality_report_total) which is enabled by default, and the event is only tracked when the feature flag is enabled.

Screenshots

Event tracking request from the network panel (gdk):

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done