Add csv and etdump files to gitignore

[mcr229]

Adding .csv files and .etdump files to the git ignore as these shouldn't be committed in.

[mcr229]

Stack from ghstack (oldest at bottom):

• [KleidiAI] turn on SME2 by default #13233
• [KleidiAI] Always attempt activation packing #13232
• [Profiling] Add python scripts to generate per-op profiling from etdumps #13302
• -> Add csv and etdump files to gitignore #13301

[pytorch-bot]

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❌ 2 New Failures

As of commit 2509c1c with merge base a84b3c9 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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