…#15779)

* fix(cache): make disabled cache no-op instead of throwing

Libraries using Astro.cache/context.cache shouldn't need try/catch
to handle the case where caching isn't configured. DisabledAstroCache
now silently no-ops with a one-time console warning instead of throwing.
invalidate() still throws since callers expect purging to work.

Adds cache.enabled property to CacheLike so libraries can check
whether caching is active.

* Use logger

* Update .changeset/cache-disabled-no-throw.md

Co-authored-by: Sarah Rainsberger <5098874+sarah11918@users.noreply.github.com>

---------

Co-authored-by: Sarah Rainsberger <5098874+sarah11918@users.noreply.github.com>

Co-authored-by: astrobot-houston <fred+astrobot@astro.build>

…rrectly (#15809)