Remove pytest from dependencies

[twsl]

Summary

Fixes #15379

Release notes: build

Test plan

Build via CI

[pytorch-bot]

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[github-actions]

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[Copilot]

Pull request overview

Moves pytest and related plugins out of the core executorch runtime dependencies and into the developer requirements, aligning install-time dependencies with intended usage (fixes #15379).

Changes:

• Remove pytest/plugins from [project].dependencies in pyproject.toml.
• Add pytest/plugins to requirements-dev.txt so they remain available for development/test workflows.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
requirements-dev.txt	Adds pytest and common pytest plugins to dev requirements.
pyproject.toml	Drops pytest-related packages from the published runtime dependency list.

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