[fix] ActionButton: Align dropdown menu to button group

[MAYANKSHARMA01010]

Notes for Reviewers

This PR fixes #1809
Related Meshery Issue: meshery/meshery#21450

Description:

• Replaced dynamic anchorEl state with a stable anchorRef attached to <ButtonGroup>.
• Configured <Popper> to anchor to anchorRef.current with placement="bottom-start" for consistent dropdown alignment.
• Added toggle fallback on the primary button when defaultActionClick is not provided.
• Added disabled?: boolean support to the Option interface and passed it to MenuItem.
• Added unit test suite in src/__testing__/ActionButton.test.tsx.

Signed commits

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📥 Commits

Reviewing files that changed from the base of the PR and between 1dd6141 and 600e8c6.

📒 Files selected for processing (2)

• src/__testing__/ActionButton.test.tsx
• src/custom/ActionButton/ActionButton.tsx

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