Skip test_mimi in internal CI

[rascani]

Summary: Marking the BUCK target with ci.skip_target() excludes it from internal CI only — the test is structurally fine and still runs in OSS CI.

Differential Revision: D104304516

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19379

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❌ 1 New Failure

As of commit 79f55f3 with merge base fa857bd ():

NEW FAILURE - The following job has failed:

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

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[meta-codesync]

@rascani has exported this pull request. If you are a Meta employee, you can view the originating Diff in D104304516.

[github-actions]

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