frontend: Add Storybook stories for ResourceTableMultiActions

[mystic-06]

Summary

This PR adds Storybook stories for ResourceTableMultiActions by covering all
meaningful selection states of the multi action buttons.

Related Issue

Fixes #4693

Changes

• Added ResourceTableMultiActions.stories.tsx with five stories covering
  restartable, non-restartable, mixed, and empty selection states
• Added snapshot files for all five stories

Steps to Test

1. Run npm run storybook in the frontend directory
2. Navigate to Resource/ResourceTableMultiActions in the Storybook sidebar
3. Click through each story to verify UI states

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mystic-06 / name: Dhruv Sharma (795515b)

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[mystic-06]

/easycla