Add "Update Branch" button to Pull Requests (#9784)
* add Divergence
* add Update Button
* first working version
* re-use code
* split raw merge commands and db-change functions (notify, cache, ...)
* use rawMerge (remove redundant code)
* own function to get Diverging of PRs
* use FlashError
* correct Error Msg
* hook is triggerd ... so remove comment
* add "branch2" to "user2/repo1" because it unit-test "TestPullView_ReviewerMissed" use it but dont exist jet :/
* move GetPerm to IsUserAllowedToUpdate
* add Flash Success MSG
* imprufe code
- remove useless js chage
* fix-lint
* TEST: add PullRequest ID:5
Repo: user2/repo1
Base: branch1
Head: pr-to-update
* correct comments
* make PR5 outdated
* fix Tests
* WIP: add pull update test
* update revs
* update locales
* working TEST
* update UI
* misspell
* change style
* add 1s delay so rev exist
* move row up (before merge row)
* fix lint nit
* UI remove divider
* Update style
* nits
* do it right
* introduce IsSameRepo
* remove useless check
Co-authored-by: Lauris BH <lauris@nix.lv>
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