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.
Evgeniy.Zhelenskiy