[meta] Release preparation steps for 11.1.0 and 10.4.0

Release preparation worksheet

11.1.0 and 10.4.0 release prep spreadsheet: Needs creation.

Committer Google Drive folder (restricted access)

11.1 and 10.4 preparation

Release note drafts

🌱 [meta] 11.1.0 and 10.4.0 release notes Active

Frontpage post draft

TBD

Remaining tasks

TBD

Done

• None yet.

Target issues

• None yet.

The target issues may change and there is no guarantee that they will be in the release.