[terraform] Staging: deploy Blob 1.2.1, Identity 0.42

Summary:
Identity 0.42 now depends on Blob 1.2.1
Most changes are related to server-side holder removal

Blob changelog since 1.2.0:

• 4dd91d929b [comm-lib] Add missing feature dependency to Cargo.toml
• b5d7583ea7 [comm-lib][blob-client] Add support for removing holders by tags
• 20d0368eeb [blob] Add support for removing holders by tags
• 6c86404282 [comm-lib][blob] Add tags support to remove holders request payload
• 406f6cc12f [comm-lib][blob-client] Extract error handling logic
• e31290555a [comm-lib] Add remove_multiple_holders to Blob client
• 4762e1c226 [blob] Add DB method to query holders by prefix
• b6f911a681 [blob] Move HTTP request/response types to comm-lib
• dfa118b6b3 [terraform] Add index for holder prefixes
• b069c41703 [blob] Store indexable tag in DDB for holders
• c9f0d1d0a0 [blob] Don't log request payload in tracing span

Identity changelog since 0.41:

• 7617de987f [identity] Remove blob holders on logout and account deletion
• bc71ac4c9c [identity] Pass Blob client to AuthenticatedService
• f54b7e5ef5 [identity] Add function to remove holders for devices
• 4dd91d929b [comm-lib] Add missing feature dependency to Cargo.toml
• b5d7583ea7 [comm-lib][blob-client] Add support for removing holders by tags
• 6c86404282 [comm-lib][blob] Add tags support to remove holders request payload
• 406f6cc12f [comm-lib][blob-client] Extract error handling logic
• e31290555a [comm-lib] Add remove_multiple_holders to Blob client
• 51d280b640 [identity] Move backup and tunnelbroker mods to a submodule
• 450ee7a77c [identity] Add config for Blob service URL

Test Plan: terraform plan

Reviewers: kamil, will, varun

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13711