Remove react references from core OverlayService apis

[pgayvallet]

Summary

Remove usages of React API/types in the core OverlayService, by changing the signature with something framework agnostic.

Pain points of the PR are:

• some plugins were mixing KibanaReactOverlays and core.OverlayService in their usage, as they were effectively the same signature, which is no longer the case in this PR.
• Some tests were testing the react tree renderer after calls to the overlayservice. The MountWrapper we now use to mount native HTML element in the EUI components makes this harder ( forced to use enzyme#mount, and even this does not work in some cases)

Fixes #37894

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately
• This includes a feature addition or change that requires a release note and was labeled appropriately

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[elasticmachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request
• Commit: b360cb7