Redeploy caused a failed to decrypt async call request error

[gak]

Previous deploy was related to checking if the key had changed, closely to another PR before that:

• 3da112c

Logs: https://sq-tbd.slack.com/archives/C04PEQERFM0/p1726098113325829?thread_ts=1726095281.120829&cid=C04PEQERFM0

Sep 12 08:40:57.104 ftl-controller Starting FTL controller
Sep 12 08:40:57.104 ftl-controller Web console available at: http://10.2.109.16:8892
Sep 12 08:40:57.104 ftl-controller Encryption key found, using it

...

Sep 12 08:45:03.276 ftl-controller Created deployment dpl-customers-4hwzuv6k3g8nduq6
Sep 12 08:45:04.277 ftl-controller failed to decrypt async call request: failed to decrypt binary with subkey async: failed to decrypt: aead_factory: decryption failed

Potential problems:

• Key was changed: seems unlikely since there is a check on startup to verify the correct key, but could be a bug in the checking code (the PR above)
• NULL or empty string in the async rows.. it not checked properly, this could cause this error.

[gak]

• Key does not appear to have changed based on the logs
• No nulls or empty strings in the request field (where the error mentioned)