Duplicated messages in testdata appeared because default renderer
renders diagnostic spans ambiguously. It shows only start position.
In fact, there are 3 failures, 2 of them distinguish only by the
diagnostic end offset. See youtrack for more information.
The issue about inconvenient rendering is KT-64989.
#KT-64608
Also, remove setting the value of allowUnstableDependencies to true if
K2 is used because we want K2 to report errors (as K1 does) on
unstable-ABI dependencies.
#KT-61598 Fixed
This is needed because after changing default language version to 2.0,
we still need to test many scenarios from this test in K1.
Move K1-specific tests to OldCompileKotlinAgainstCustomBinariesTest, and
K2-specific tests to FirCompileKotlinAgainstCustomBinariesTest.
Mute failing K2 tests via `muteForK2`. It will throw exception if the
muted test will suddenly start passing.
"oldJvm*" tests are no longer testing the old JVM backend, so remove
that prefix from them. Also, remove the test "firAgainstOldJvm" because
it is now checking something that cannot NOT work.
Evgeniy.Zhelenskiy