Add panel to preview panel page

What does this MR do?

This feature is behind a feature flag:metrics_dashboard_new_panel_page See: &2882

Part of #228761 (closed) This MR adds the first iteration of panel builder component. This MR depends on !37563 (merged)

This change adds a new panel builder component that will show a panel in the future, this panel builder is connected to the URL query parameters and calls a stubbed endpoint that does not work yet.

Features:

• Copy panel
• Stores the yml in the URL

Next step:

• Integrate with backend endpoint !37930 (merged)
• Add other components to the page

Screenshots

Updated version (with improved margins and font sizes):

UX behaviors:

before	after: initial view	after: clicking on review panel	after: copy panel feature

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Closes #228761 (closed)