checkout between similar Combination can leave stale "HEAD detached at" status.

[ndhaller]

"edkrepo checkout" between two combo with similar tags does not update the "HEAD detached at " message for the repo.

Create three tags on a repo, tag_a , tag_b, tag_a2, where tag_a and tag_a2 are associated to the same commit.
Create three Combination in a manifest, combo_a, combo_b, and combo_a2 that use the tags above.

Checkout combo_a , then combo_a2, and check status:

edkrepo checkout combo_a
edkrepo checkout combo_a2
edkrepo status 

edkrepo status (and git status) shows "HEAD detached at tag_a", functionally correct, but unexpected for combo_a2.

Checkout combo_a , combo_b, then combo_a2, and check status:

edkrepo checkout combo_a
edkrepo checkout combo_b
edkrepo checkout combo_a2
edkrepo status 

edkrepo status (and git status) shows "HEAD detached at tag_a2" as expect for combo_a2.

Similar behavior when running just git commands below:

git checkout tag_a
git checkout tag_a2
git status

Tested on git version 2.39.1.windows.1