Add note about internal templates
What does this MR do and why?
Related to #379030 (closed)
The purpose of this MR is to add a warning note into these templatse so that it is clear to external users that this template is intended for GitLab internal use only and will likely fail.
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.