Enhance local repository regex matching conditions

[jguttman94]

The existing regex expression is not complex enough to handle projects within groups/subgroups in GitLab.

See this regex101 for EXISTING support
See this regex101 for PROPOSED support

[danger-public]

	2 Errors
🚫	Please include a CHANGELOG entry. You can find it at CHANGELOG.md.
🚫	Tests have failed, see below for more information.

	1 Warning
⚠️	Tests were not updated

Tests:

File	Name
gitlab_spec.rb	Danger::RequestSources::GitLab valid server response #update_pull_request! supports inline comments deletes non-sticky comments if no violations are present
gitlab_spec.rb	Danger::RequestSources::GitLab valid server response #update_pull_request! supports inline comments deletes inline comments if those are no longer relevant
gitlab_spec.rb	Danger::RequestSources::GitLab valid server response #update_pull_request! supports inline comments edits existing inline comment instead of creating a new one if file/line matches
gitlab_spec.rb	Danger::RequestSources::GitLab valid server response #update_pull_request! supports inline comments skips inline comments for files that are not part of the diff

Generated by 🚫 Danger

[orta]

These test fails could be legit?

[orta]

poke

[jguttman94]

apologies, haven't been very active recently. these very well could be valid test failures, and since it's been a long time since I opened this PR, I've forgotten what scenario spawned this change.