test: Add continuous testing for run-test --jvm

Add testrunner.py --jvm flag which runs run-test --jvm.

The default is still only --host, --target, but if --jvm is specified
by itself then only jvm tests will run.

Also change art-test-javac continuous test target to run with --jvm.

This is a pre-requisite to swapping our non-jvm test targets to build
with libcore instead of openjdk.

Bug: 72491947
Bug: 73888836
Test: art/test/testrunner/testrunner.py -b --jvm
Test: art/test/testrunner/testrunner.py -b --host
Test: art/test/testrunner/run_build_test_target.py art-test-javac
Change-Id: I114327008d57e88409d36ac6713b809e593f7802