Remove free_access method use by Amazon Q and SAST Scanner

Determines whether a "service" can be used subscription-free before its cut-off date.

• Used in UserAuthorizable, Amazon Q and SAST Scanner.
• This needs to be replaced with equivalent calls into a UnitPrimitive matching the given service (there are often 1-1 mappings).
• This has a dependency on Phase 4.

Thoughts

• We could test with SAST first as this is available for .com (so we could use a feature flag)

Migrate for

• SAST is a Small
• Amazon Q is a Small
• UserAuthorizable is a larger piece of work, not a single feaure, and not 100% clear - we should "inline" whatever remains after the first two are removed.