Rename Blacklist and Whitelist for domains in application settings

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

Follow-up from https://gitlab.com/gitlab-org/growth/team-tasks/-/issues/62#note_310078811

We should use Denylist instead of Blacklist and Allowlist instead of Whitelist as defined in this issue #7554 (closed)

Tasks

• Rename labels of Blacklisted Domains and Whitelisted Domains
• Change the variable names as well or in the mean time add a comment.
• Deprecate the API fields and change the field names