See #8222 for context.
This PR removes a call to `Blob.GetBlobContent` and `Blob.DataAsync` and unifies symlink resolution:
- length was unlimited in one case
- length was truncated to 1024 chars in the other case
Now it is hard-limited to 4096 chars (ie error if larger), which is a length which seems appropriate according to https://stackoverflow.com/a/22575737.
### Tests
- Tests are already present in `tests/integration/repo_test.go:972`: `TestRepoFollowSymlink` (it caught a cap/len stupid mistake).
- [x] I did not document these changes and I do not expect someone else to do it.
- [x] I do not want this change to show in the release notes.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8323
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: oliverpool <git@olivier.pfad.fr>
Co-committed-by: oliverpool <git@olivier.pfad.fr>
