Closes https://github.com/zed-industries/zed/discussions/42583

Adds more tooltip entries and `editor::BlameRevision`,
`editor::BlamePreviousRevision` actions to use.
Started to highlight gutter blame entries that belong to currently
annotated commit.


https://github.com/user-attachments/assets/ba754e0b-6431-407c-8d79-2f8b0324fde1


Release Notes:

- Supported blaming parent revisions