"Closes" keyword should close all issues on the same line, instead of just the first one

Problem

Currently when writing Closes #41178 #4363 it closes the first issue and mentions the second one. This is not clear or intuitive.

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3801 is a good example of this, where I closed the mentioned issue, which should have been closed by the MR manually.

Propsal

Closes keyword shouldn't have to be repeated for each issue mentioned, but should work per line of noted issues.

Closes #41178 #4363 will then result in both issues closed by MR