[devtools][tests][4/N] Report disabled inspector tests as executed

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [devtools][tests][4/N] Report disabled inspector tests as executed #19868
• [ET-VK][tests][1/N] Report disabled delegate tests as executed #19867

Applies the same disabled-test treatment as the prior diffs in this stack to the devtools inspector tests. Some test runners preserve stale failure state when tests report through unittest skip results, so this replaces the conditionally disabled coverage with a local decorator that keeps the tests discoverable, logs their disabled reason, and produces an executed result.

Adds a disable_if decorator that mirrors unittest.skipIf (evaluating the condition at decoration time) and converts the three Windows-gated test cases to use it.

Differential Revision: D106736354

[pytorch-bot]

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 362a1ad with merge base c8c04e4 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 2a140afad16ee8b41a8c0379c2b033529cec02b2a150984dcf4782529c3c6134 /exec failed with exit code 139

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

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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