Support git-blame-ignore-revs file

[TobiX]

Feature Description

Git has the option to ignore specific revisions in its blame view. This is e.g. useful for hiding automatic refactorings or bulk-reformattings from the history (https://git-scm.com/docs/git-config#Documentation/git-config.txt-blameignoreRevsFile). It would be nice if Gitea would honour such file(s) in its blame view.

While there is no "standard" file name for a repository-wide file for this feature, the name .git-blame-ignore-revs has been adopted by most projects (and is supported by GitHub):

• https://moxio.com/blog/ignoring-bulk-change-commits-with-git-blame/
• https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view
• https://github.blog/changelog/2022-03-24-ignore-commits-in-the-blame-view-beta/
• https://www.stefanjudis.com/today-i-learned/how-to-exclude-commits-from-git-blame/

GitLab would also use that filename when implementing this feature:

• https://gitlab.com/gitlab-org/gitlab/-/issues/31423
• https://gitlab.com/gitlab-org/gitaly/-/merge_requests/4177

As an example, here is a blame view which uses the file:

• https://github.com/apache/maven/blame/master/maven-core/src/main/java/org/apache/maven/classrealm/DefaultClassRealmManager.java

Screenshots