removed edge platform BKC templates from external view

[srmungar]

Merge Checklist

All boxes should be checked before merging the PR

• The changes in the PR have been built and tested
• Documentation has been updated to reflect the changes (or no doc update needed)
• Ready to merge

Description

Any Newly Introduced Dependencies

How Has This Been Tested?

[Copilot]

Pull request overview

This PR removes Edge Platform/BKC-specific image templates (PTL variants) from the repository’s externally visible image-templates/ set, reducing exposure of internal-only build configurations.

Changes:

• Removed Ubuntu 24.04 PTL template variants (including DLS/M9).
• Removed EMT3 PTL EMF template variants (RT and non-RT).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
image-templates/ubuntu24-x86_64-minimal-ptl.yml	Removed PTL-specific Ubuntu 24.04 minimal desktop raw template from external templates.
image-templates/ubuntu24-x86_64-minimal-ptl-m9.yml	Removed PTL M9 variant template from external templates.
image-templates/ubuntu24-x86_64-minimal-ptl-dls.yml	Removed PTL DLS variant template from external templates.
image-templates/emt3-x86_64-ptl-emf-rt-raw.yml	Removed PTL EMF real-time raw template variant from external templates.
image-templates/emt3-x86_64-ptl-emf-raw.yml	Removed PTL EMF raw template variant from external templates.

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[magerstam]

LGTM