Removed repo format validation

[eva-vashkevich]

Summary

Fixes #12204

Removing git repo format validation because we want to test the formatting more for now.
Added #12432 to add better format validation to this page.

Occurred changes and/or fixed issues

Removed format validation for the git repository input field.
Field is still marked as required.

Technical notes summary

None

Areas or cases that should be tested

Fleet -> Git repo -> Create
Repository URL field should be marked as required, but we do not test the format of the url

Areas which could experience regressions

None

Screenshot/Video

Checklist

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