This PR removes all remaining unnecessary cache clearing in tests
from the codebase since we now clear all cachable classes between
tests making this functionally unnecessary.
Original PR to automatically clear caches:
- https://github.com/Homebrew/brew/pull/16746
I also moved the `Utils::Analytics` module to use cachable so
that we don't have to clear caches specifically in tests anymore.
Currently we are including this in the API but not actually
parsing and loading it correctly from the JSON. I think this
was an oversight when addressing feedback and refactoring
the JSON shape. Not a big deal, of course, because I'm the
only person using it right now.
I found this out while testing installs using the API and I got
this error while running `brew reinstall tree`.
```
Warning: Cannot verify integrity of '60fc4212023d3fef00e6de4b9f3f0d63402cf3eca00778d09f4f2d3481b524a1--tree.rb'.
No checksum was provided.
```
These tests cover both generating and loading formulae from the JSON
bundle. The tests are not comprehensive but they do provide a nice
sanity check that things are working as expected.
Rather than failing every time we fail to update (breaking most usage
while offline) instead only fail if we cannot obtain the JSON and we
don't have a valid local file we can use.
Also tweak the timeout and retry logic and values to make a bit more
sense in this context and not be so noisy when offline.
