Remove claim capsule code

[gndelia]

Description

Dropping some code that's no longer in use. We no longer use the claiming process with email + Zappier, so we can drop the microservice used for that + the database with emails that have already claimed the capsule. TBD who can drop this

Screenshots

No visible changes for the user

Related issue(s)

Related to #453 (I am leaving it open because there are secrets to remove, and lambdas to drop)

Checklist

• [ ] Manual testing passed.
• [ ] Automated tests added, or N/A.
• [ ] Documentation updated, or N/A.
• [ ] Environment variables set in CI, or N/A.