feat: repo org migration script support for single repo execution

[pwnage101]

ENT-11240

This enables support for the following make target:

make dev.migrate-repo-git-to-edx.license-manager
make dev.migrate-repo-git-to-edx.enterprise-access
make dev.migrate-repo-git-to-edx.enterprise-subsidy
make dev.migrate-repo-git-to-edx.enterprise-catalog
etc.

[Copilot]

Pull request overview

This PR adds support for migrating individual enterprise repository clones from the openedx to edx GitHub organization, in addition to the existing bulk migration functionality. The changes enable developers to run repository-specific migration commands like make dev.migrate-repo-git-to-edx.license-manager.

Key changes:

• Added optional single-repository argument support to the migration shell script
• Renamed and updated Makefile targets to support both bulk and individual repo migrations
• Added pattern rules to enable service-specific shortcut syntax

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
migrate-repo-git-to-edx.sh	Added conditional logic to accept a single repository name as an argument and limit execution to that repository only
Makefile	Renamed migrate-enterprise-repos target to migrate-repo-git-to-edx, added dev.migrate-repo-git-to-edx.% pattern target, and created shortcut pattern rule using ALL_SERVICES_LIST

Comments suppressed due to low confidence (1)

migrate-repo-git-to-edx.sh:31

• The script accepts an argument but doesn't validate if the provided repository name is valid. If an invalid repository name is passed (e.g., a typo), the script will silently skip it with "Skipping $repo (not found)" without indicating that the repository name itself might be incorrect. Consider adding validation to check if the provided repository is in the list of known repos, or at least provide a more informative message.

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[kiram15]

LGTM! Just make sure to link this PR in the ticket itself as well