Merge experimental and stable attributes per resource type.

[jsuereth]

Merge the experimental and stable portions of resource together where previously we had them split by group but still had them with the same type.

Explicitly calls out resource "types" that have mixed-attribute status.

Note: we can re-enable the appropriate resource compatibility checks AFTER this PR has been released in a new version.

Changes

• Merge service experimental + stable attributes in the same group.
• Create telemetry.distro attributes with the telmetery.distro.* attributes.
• Modify markdown so that both stable + experimental attributes show up joined for a given resource type. This should be temporary just for service resource.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

stale

PR has changed - creating new telemtery.distro resource now

[lmolkova]

🚀