Move non-runtime deps to dev/example requirements

[cdeil]

Follow up to #15379 and #18188 by trimming more non-runtime dependencies from the published executorch wheel metadata.

cc @jackzhxng and @mergennachin since you commented/merged the related issue/PR.

• Move expecttest, hypothesis, kgb, and parameterized out of [project].dependencies and into requirements-dev.txt, since they are only used by tests.
• Move scikit-learn to requirements-examples.txt, since the in-tree uses are example scripts rather than core runtime paths.
• Drop the direct mpmath runtime pin, since sympy already pulls it transitively.

This keeps user installs lighter and avoids forcing test/example-only packages into downstream environments.

[pytorch-bot]

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❌ 1 New Failure, 4 Unrelated Failures

As of commit 1b7da2b with merge base ccaf17e ():

NEW FAILURE - The following job has failed:

• Copilot code review / Cleanup artifacts (gh)
  Process completed with exit code 1.

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)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv2_model
• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv2_model
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[Copilot]

Pull request overview

This PR trims non-runtime Python dependencies from the published executorch wheel metadata, continuing the effort from #15379 / #18188 to keep downstream installs lightweight by moving test- and example-only packages out of [project].dependencies.

Changes:

• Move expecttest, hypothesis, kgb, and parameterized from pyproject.toml runtime dependencies into requirements-dev.txt.
• Move scikit-learn from runtime dependencies into requirements-examples.txt (it’s only imported by example scripts).
• Drop the direct mpmath==1.3.0 runtime pin (no in-tree direct imports; sympy remains a runtime dependency).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
requirements-examples.txt	Adds scikit-learn to the examples requirements to support example-only imports.
requirements-dev.txt	Adds test-only dependencies needed by the repo’s test suite/tooling tests.
pyproject.toml	Removes non-runtime dependencies from wheel metadata and drops the direct mpmath pin.

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