Convert unconditional GTEST_SKIP tests to DISABLED_ prefix

[rascani]

Summary:
A number of kernel unit tests are skipped unconditionally, with the very first statement is GTEST_SKIP() << "Dynamic shape not supported";. These tests therefore emit a SKIPPED result on every invocation while the feature is
unimplemented.

The googletest recommended idiom for this case is the DISABLED_ name
prefix:

• The test is still compiled, so the documenting body cannot rot.
• The test is not executed by gtest at all (no result is emitted).

This commit applies that conversion mechanically to every
unconditionally-skipped GTest in the ExecuTorch tree.

Disabled tests can still be opted into on demand via gtest's
--gtest_also_run_disabled_tests flag.

Differential Revision: D104126199

[pytorch-bot]

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❌ 1 New Failure, 17 Unrelated Failures

As of commit cae64d1 with merge base af90130 ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-lora-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-lora-multimethod-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-vulkan-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  [ FAILED ] OpGridSampler2dTest.BatchSizeMismatchDies
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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