Hide merge request option in IDE when merge requests are disabled

What does this MR do?

Hides the merge request radio group option in the commit panel of the web IDE when the projects merge requests are disabled.

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/45698

Edited by Filipa Lacerda

Merge request reports

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