fix(embedded): Hide anchor links in embedded mode

[Vitor-Avila]

SUMMARY

The Tab and Header UI elements in the dashboard have an AnchorLink. These are currently visible in embedded mode. Embedded users are external that don't have access to the instance directly, so these links should not be visible.

This PR hides AnchorLinks in embedded mode.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before

After

TESTING INSTRUCTIONS

Tests added. For manual testing:

1. Create a dashboard containing at least a header and a tab.
2. Load this dashboard in embedded mode.
3. Validate the AnchorLinks are not visible.

ADDITIONAL INFORMATION

• [ ] Has associated issue:
• [ ] Required feature flags:
• [ ] Changes UI
• [ ] Includes DB Migration (follow approval process in SIP-59)
  • [ ] Migration is atomic, supports rollback & is backwards-compatible
  • [ ] Confirm DB migration upgrade and downgrade tested
  • [ ] Runtime estimates and downtime expectations provided
• [ ] Introduces new feature or API
• [ ] Removes existing feature or API