extension_host: Rename `Extension` variants so that the version number components are clearer (#27507)

This PR renames the variants of the `Extension` enum with delimiters
between the version number components so that it's clearer which version
of the extension API they refer to.

Release Notes:

- N/A
e67ad1a1b6Marshall Bowers committed on 3/26/2025, 3:54:14 PM· committed by GitHubparent82536f5
1 file changedLine totals unavailable