fix(gomod): support .git indicator on private ee gitlab

[bastianccm]

Changes

This change adds the behaviour from #13352 to private gitlab instances.

Context

Following up on #13352, gitlab installations which do not have a gitlab. URL prefix are not captured by the Regex in

renovate/lib/modules/datasource/go/base.ts

Line 21 in c3e5e07

/^(?<regExpUrl>gitlab\.[^/]*)\/(?<regExpPath>.+?)(?:\/v\d+)?[/]?$/

This change adds the same behaviour for repositories which set a Gitlab host-rule, which indicates that we are dealing with Gitlab.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 32.161.2 🎉

The release is available on:

• GitHub release
• 32.161.2

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