Remove deprecated daemon flags.

What does this MR do?

Removes deprecated daemon-* flags.

Closes:

• #599 (closed)

Context:

• gitlab!82965 (comment 912086006)
• https://docs.gitlab.com/ee/update/deprecations.html#gitlab-pages-running-as-daemon

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines