Update testenv -ga tag check to handle jdk8u aarch32 port repo and checking for Lightweight git tags

[andrew-m-leonard]

The jdk8u aarch32 repo is tagged with different different tag names, and uses git Lightweight tagging
Update the -ga commit search to handle the aarch32-port-jdk8u port repo, and the detection of Lightweight tags

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[steelhead31]

LGTM

[sxa]

Approving ... I'm assuming the correct number of backslashes has been verified for the grep operations here