Remove Jira Connect public key storage config

See merge request !112714



Merged-by: Allen Cook <acook@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Allen Cook <acook@gitlab.com>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Co-authored-by: Andy Soiron <asoiron@gitlab.com>