[Feature flag] Removal of `ssh_key_expiration_email_notification`

Feature

The :ssh_key_expiration_email_notification feature flag was previously enabled by default and should be removed.

Owners

• Group: groupcompliance
• Slack channel: #g_manage_compliance
• DRI: @mwoolf
• PM: @stkerr

Removal

This is an important phase, that should be either done in the next Milestone or as soon as possible. For the cleanup phase, please follow our documentation on how to clean up the feature flag.

• Remove :feature_name feature flag

  • Remove all references to the feature flag from the codebase
  • Remove the YAML definitions for the feature from the repository
  • Create a Changelog Entry

• Clean up the feature flag from all environments by running this chatops command in #production channel /chatops run feature delete some_feature.

• Close this issue after the feature flag is removed from the codebase.