ci: remove code_format job from FixPR workflow

[cakebaker]

This PR removes the code_format job from the FixPR workflow. The job recently started to fail and from looking at it, it seems to be unnecessary as we already check for the correct formatting in the code-quality workflow.

[codspeed-hq]

CodSpeed Performance Report

Merging #9043 will improve performances by 2.79%

_{Comparing cakebaker:ci_remove_update_format_job (4d4341d) with main (85c92f2)}

Summary

⚡ 2 improvements
✅ 103 untouched
⏩ 74 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	du_balanced_tree[(5, 4, 10)]	9.3 ms	9.1 ms	+2.12%
⚡	du_human_balanced_tree[(5, 4, 10)]	10.4 ms	10.1 ms	+2.79%

Footnotes

1. 74 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)