Remove `test.test_json.test_tool.TestTool.test_colors` from PGO

[zooba]

Bug report

The test seems to fail a lot during PGO profiling.

It may be fine just to entirely remove test_tool, if it's not really core code paths. Probably worth someone doing the benchmarking here to see if it's useful.

[ashm-dev]

@zooba I compile cpython with pgo quite a lot, and none of my tests have failed if sanitizers are not enabled. So maybe you have some kind of problem with the build?)