Add ability to link to a line on File Blame page

In !85827 (merged) we added paging to the File Blame page, but when a user want to link to a line that is not on page 1 they would have to pass a page number with the line number (e.g. CHANGELOG.md?page=2#L1100).

It would be more intuitive if a user only needs to pass the line number to link to a line.

This issue proposes adding the ability to link to a line without having to pass a page number.

current	proposal
needs the context of what page the line is on	no need to pass a page number to link to a line
https://gitlab.com/gitlab-org/gitlab/-/blame/master/CHANGELOG.md?page=2#L1100	https://gitlab.com/gitlab-org/gitlab/-/blame/master/CHANGELOG.md#L1100

Update: Due to limitations(not being able to access hash on the server which means we know the line number only on the client) we ended up with the following solution: to be able to send user to a correct blame page

1. When user clicks on Blame button on the top of the page we calculate correct page to send him to
2. When user just pastes a url with line at the end we check if the page parameter should be added and perform an actual redirect if needed.