Update PR templates: mention permissions (Azure#29209)

* Update control_plane_template.md: mention permissions

* Update data_plane_template.md

Author: Konrad Jamrozik

.github/PULL_REQUEST_TEMPLATE/control_plane_template.md

@@ -51,6 +51,7 @@ If one or multiple validation error/warning suppression(s) is detected in your P
 ## Getting help
 
 - First, please carefully read through this PR description, from top to bottom. Please fill out the `Purpose of this PR` and `Due diligence checklist`.
+- If you don't have permissions to remove or add labels to the PR, request `write access` per [aka.ms/azsdk/access#request-access-to-rest-api-or-sdk-repositories](https://aka.ms/azsdk/access#request-access-to-rest-api-or-sdk-repositories")
 - To understand what you must do next to merge this PR, see the `Next Steps to Merge` comment. It will appear within few minutes of submitting this PR and will continue to be up-to-date with current PR state.
 - For guidance on fixing this PR CI check failures, see the hyperlinks provided in given failure 
   and https://aka.ms/ci-fix.

.github/PULL_REQUEST_TEMPLATE/data_plane_template.md

@@ -76,6 +76,7 @@ The [Azure API Review Board](https://aka.ms/azsdk/onboarding/restapischedule) is
 ## Getting help
 
 - First, please carefully read through this PR description, from top to bottom.
+- If you don't have permissions to remove or add labels to the PR, request `write access` per [aka.ms/azsdk/access#request-access-to-rest-api-or-sdk-repositories](https://aka.ms/azsdk/access#request-access-to-rest-api-or-sdk-repositories") 
 - To understand what you must do next to merge this PR, see the `Next Steps to Merge` comment. It will appear within few minutes of submitting this PR and will continue to be up-to-date with current PR state.
 - For guidance on fixing this PR CI check failures, see the hyperlinks provided in given failure 
   and https://aka.ms/ci-fix.