Closes#11355, namely:
1. bug: editing the note does not edit the orginal content, but the rendered content
- 16368c4ccb
- edit raw notes instead of rendered notes
2. bug: editing existing note on single-commit PR page leads to 404 page because it sends a POST request to `/OWNER/REPO/pulls/ID/commits/COMMIT_HASH/notes`
- f036fc55db
- add new paths for the actions on pull request pages for `/OWNER/REPO/pulls/ID/commits/COMMIT_HASH/notes` and `/OWNER/REPO/pulls/ID/commits/COMMIT_HASH/notes/remove`
3. feat: both for adding and editing there is no `Cancel` button
- 58d8c7cc87
- moved both the `Cancel` and the `Save`/`Edit` button to the right for better consistency how, e.g., issue comments are edited/created.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11365
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Robert Wolff <mahlzahn@posteo.de>
Co-committed-by: Robert Wolff <mahlzahn@posteo.de>
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