Remove deprecated GPUStatsMonitor callback

[rschireman]

What does this PR do?

Fixes part of #12521 remove pytorch_lightning.callbacks.gpu_stats.GPUStatsMonitor

resolves #9924

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[akihironitta]

Thank you for working on this!

[rschireman]

should I remove the tests.helpers.runif.RunIf import in test_remove_1-7.py so the pep8 check works in the pre-commit test?

tests/deprecated_api/test_remove_1-7.py:42: [F401] 'tests.helpers.runif.RunIf' imported but unused

[akihironitta]

should I remove the tests.helpers.runif.RunIf import in test_remove_1-7.py so the pep8 check works in the pre-commit test?

tests/deprecated_api/test_remove_1-7.py:42: [F401] 'tests.helpers.runif.RunIf' imported but unused

@rschireman Yes, please remove the import statement there! Thanks for checking :)

[rschireman]

@awaelchli Thanks for removing that import! Now the TPU test is failing -- I looked through the output and couldn't find where it failed, only that it failed on deploying to the Kubernetes cluster. I also noticed that my other pull request (#12658) has this issue. Any thoughts?

[luigicampanaro]

Hi! Is there anything implementing the functionality of GPUStatsMonitor? I logged DeviceStatsMonitor but I got 125 plots (x2), and I'm not sure any of them is relevant to GPU memory_utilization and gpu_utilization