Remove serving pages from artifacts archives

What does this MR do?

After rolling out only pages deployments, it turned out that we can serve about 60% of the traffic on .com via deployments only.

So this MR removes support for artifacts archives as source for pages zip archives.

It doesn't remove artifacts archive id from the pages metadata and it's assignment. I think we can clean this up later, since it will be harder to revert.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team