Build/Test Tools: Remove the unused PHPUnit profiler

[lancewillett]

Trac ticket: https://core.trac.wordpress.org/ticket/65888

What this changes

Removes the unused tests/phpunit/includes/wp-profiler.php file.

The profiler has no callers and is never loaded by the PHPUnit bootstrap. Its object-cache instrumentation also depends on properties that are no longer available.

Removing it prevents future maintenance work on test tooling that cannot run. If profiling is needed later, it can be built against the current test suite and object-cache APIs.

Testing

• git diff --check passed.
• Confirmed no references to wp-profiler, WPProfiler, or its wppf_*() helpers remain.
• Confirmed the PHPUnit bootstrap does not load the profiler.

No runtime tests were added because this removes unreachable tooling.

[github-actions]

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[github-actions]

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