chore: rename `Gitlab` to `GitLab` (#3200)

* chore: rename `Gitlab` to `GitLab`

Signed-off-by: Adam Setch <adam.setch@outlook.com>

* undo code changes - breaks refs

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Signed-off-by: Adam Setch <adam.setch@outlook.com>
Co-authored-by: timothycarambat <rambat1010@gmail.com>