add gitRepository helper template
General MR
Summary
GitRepository template per package was largely redundant and needs optimization. add gitRepository helper template to generate per package. Normalize labels. Removes 800 lines of redundant boilerplate code.
Linked Issue
Closes #3147 (closed)
Upgrade Notices
Flux GitRepositories are now generated per package using a shared helper in the bb umbrella chart/templates/_helpers.tpl file. Labels have also been normalized per gitRepository. Existing functionality should be unaffected by this change.