Improve accessibility of remove icon buttons

What does this MR do and why?

A couple of accessibility improvements for remove icon buttons:

• Add tooltip for easier visual identification
• Use more general message in a shared component
• Provide more specific messages for screen readers and shorter ones for tooltip

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Enable the beyond_identity_exclusions feature flag
2. Navigate to Admin > Settings > Integrations
3. Click on Beyond Identity > Configure
4. Click on the Exclusions tab
5. Click on Add exclusions to open the Add exclusions Drawer
6. Search and select Projects in the drawer
7. Click on Add exclusions
8. Check tooltips on remove icon buttons when using keyboard or mouse. Check remove icon buttons with screen reader (can be VoiceOver on macOS. Go to Settings/Accessibility and turn a toggle for VoiceOver, then tab through UI).