Add Typespec conversion option to intake template (#29616)

* Add Typespec converstion option to intake template

Intake form needs an option to indicate the author is converting swagger to Typespec. This change adds a checkbox for that option and indicates it should not be combined with adding a new API version.

* Update control_plane_template.md

Update text and add link to TypeSpec conversion docs per feedback.

* Update control_plane_template.md

* Update control_plane_template.md

Update help link for TypeSpec conversion

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Co-authored-by: Konrad Jamrozik <[email protected]>

Author: mentat9

.github/PULL_REQUEST_TEMPLATE/control_plane_template.md

@@ -17,6 +17,7 @@ What's the purpose of this PR? Check the specific option that applies. This is *
   - [ ] New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to [OpenAPI specs PR creation guidance](https://aka.ms/azsdkdocs/createopenapispec)).
   - [ ] Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
   - [ ] Update existing version to fix OpenAPI spec quality issues in S360.
+  - [ ] Convert existing [OpenAPI spec to TypeSpec spec](https://aka.ms/typespec/conversion) (do not combine this with implementing changes for a new API version).
   - [ ] Other, please clarify:
     - _edit this with your clarification_