[UI] Use a distinct checkbox style for the "Select All" control

Description

The checkbox used for the "Select All" action in the table header uses the same visual style as the row selection checkboxes, making it difficult to distinguish between selecting all resources and selecting an individual row.

The "Select All" checkbox should have a distinct visual style to clearly communicate its global action, similar to the checkbox style used in the search dropdown.

Current Behavior

• The table header checkbox ("Select All") looks identical to the row selection checkboxes.
• Users may mistake it for another row selection checkbox.

Expected Behavior

• Use a visually distinct checkbox style for the "Select All" control.
• Keep row selection checkboxes unchanged.
• Ensure the styling aligns with the checkbox used in the search dropdown (or the designated global selection control) for consistency and improved usability.

Screenshots

• Current: Header "Select All" checkbox matches row checkboxes.

• Reference: Search dropdown uses a distinct checkbox style that better differentiates the global selection action.

Acceptance Criteria

• Update the header "Select All" checkbox to use the distinct checkbox style.
• Leave individual row checkboxes unchanged.
• Ensure visual consistency across all tables that support bulk selection.
• Verify accessibility and keyboard interaction remain unchanged.

Environment

Contributor Guides and Resources

• 🛠 Meshery Build & Release Strategy
• 📚 Instructions for contributing to documentation
  • Meshery documentation site and source
• 🎨 Wireframes and designs for Sistent site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack