drime: add optional presigned uploads and cleanup support - #9886

What does this change do?

This adds optional single-part presigned uploads to the Drime backend. When use_presigned_uploads is enabled, files with a known size below 5 MiB and at or below upload_cutoff are uploaded through Drime's presigned S3 flow. Larger files continue to use the existing standard or multipart paths according to upload_cutoff, and files with an unknown size continue to use multipart uploads.

The implementation requests a presigned URL, uploads the content without forwarding the Drime authorization header, and creates the Drime file entry afterwards. Extensionless names, including names produced by a crypt remote, use bin as the required client extension.

This also implements the backend CleanUp feature using Drime's /file-entries/delete endpoint with emptyTrash enabled.

Unit tests cover the upload selection boundaries, the complete presigned request/upload/entry flow, extensionless filenames, and emptying the trash.

Validation performed:

• go build
• go test ./backend/drime
• make quicktest
• Live uploads to Drime were tested both directly and through a crypt remote with files from 0.5 MiB to 10 MiB, covering presigned, standard, and multipart upload paths; downloaded content matched the source data
• Live cleanup was tested against Drime

Linked issue

Fixes #9750

For new or changed backends

This changes an existing backend. The focused tests and live backend checks described above pass. A full test_all run was not performed.

Checklist

• This change is trivial OR it has been discussed and agreed in the linked issue.
• I have read the contribution guidelines.
• (If I used AI tools to help write this code) I have read and understood the AI-assisted contributions guidance, and I have tested and take ownership of this change myself.
• I have added tests for all changes in this PR if appropriate.
• I have added documentation for the changes if appropriate.
• All commit messages are in house style.
• (Backend changes only) test_all passes for this backend and if submitting a new backend can provide a test account for the integration tester - see CONTRIBUTING.md.
• This Pull Request is ready for review.