Remove Jira Connect public key storage config
What does this MR do and why?
This removes the jira_connect.enable_public_keys_storage
config. It was replaced by the jira_connect_public_key_storage_enabled
application setting in !110640 (merged). The config was still around to make sure the new application setting is enabled on GitLab.com. This is now the case (gitlab-com/gl-infra/production#8392 (closed)) so we can continue removing the config.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
-
I have evaluated the MR acceptance checklist for this MR.
Related to #391330 (closed)