[snippet-bot]: Does not error on invalid product tag

[glasnt]

b/404413610

Region tags being added for new samples had green snippet-pot returns, but the region tag was invalid due to API not being onboarded into devrel-services

Steps to reproduce

1. feat(modelarmor-samples): add model armor template and prompt samples GoogleCloudPlatform/python-docs-samples#13143 (comment)

[meltsufin]

Is this more of a feature request? cc: @chingor13