fix: delete linked ssh keys correctly

[tobybellwood]

In #3462 the routine used to delete a users ssh keys could error

Error: graphql: Cannot read properties of undefined (reading 'status')

This PR fixes the Knex logic to enable these deletes.

Tested by adding a key to a user, deleting user, and readding key to different user

tobybellwood@pop-os:~/sites/lagoon$ lagoon get user-sshkeys -E user@example.com
Info: No SSH keys for user 'user@example.com'
tobybellwood@pop-os:~/sites/lagoon$ lagoon add user-sshkey -E user@example.com  --keyvalue "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINA0ITV2gbDc6noYeWaqfxTYpaEKq7HzU3+F71XGhSL/ my-computer@example"
Result: success
id: 594
tobybellwood@pop-os:~/sites/lagoon$ lagoon get user-sshkeys -E user@example.com
EMAIL                   NAME                    TYPE            VALUE 
user@example.com  my-computer@example     ssh-ed25519     AAAAC3NzaC1lZDI1NTE5AAAAINA0ITV2gbDc6noYeWaqfxTYpaEKq7HzU3+F71XGhSL/
tobybellwood@pop-os:~/sites/lagoon$ lagoon add user-sshkey -E other.user@example.com  --keyvalue "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINA0ITV2gbDc6noYeWaqfxTYpaEKq7HzU3+F71XGhSL/ my-computer@example"
Error: graphql: (conn=81218, no: 1062, SQLState: 23000) Duplicate entry 'SHA256:FfrcVNHge/3iuS4pT5cMOWzb1SxOM5tFetDPIS+4neo' for key 'key_fingerprint'
tobybellwood@pop-os:~/sites/lagoon$ lagoon delete user -E user@example.com
✔ Yes
Result: success
tobybellwood@pop-os:~/sites/lagoon$ lagoon get user-sshkeys -E user@example.com
Info: No SSH keys for user 'user@example.com'
tobybellwood@pop-os:~/sites/lagoon$ lagoon add user-sshkey -E other.user@example.com  --keyvalue "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINA0ITV2gbDc6noYeWaqfxTYpaEKq7HzU3+F71XGhSL/ my-computer@example"
Result: success
id: 596
tobybellwood@pop-os:~/sites/lagoon$ lagoon get user-sshkeys -E other.user@example.com
EMAIL                   NAME                    TYPE            VALUE 
other.user@example.com my-computer@example     ssh-ed25519     AAAAC3NzaC1lZDI1NTE5AAAAINA0ITV2gbDc6noYeWaqfxTYpaEKq7HzU3+F71XGhSL/

[shreddedbacon]

I've tested this works too