Cache downloaded external libraries/gems, which are expected not
changed so frequently.
Also sometimes downloading from zlib returns the current time as
the date header in unexpected format, and checksums mismatch at
that time.
* Add --yjit-no-type-prop so we can test YJIT without type propagation
* Fix typo in command line option
* Leave just two test workflows enable for YJIT
tool/test-bundled-gems.rb use sub processes for testing bundled gems and
doesn't support RUN_OPTS. We weren't enabling YJIT for these tests.
Use an include config with RUBY_YJIT_ENABLE to turn on YJIT for these
tests.
Note that we only test with the default call threshold in this setup,
which is the same as before YJIT was off by defauft. The
--yjit-call-threshold command line was never passed to the tests.
