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.
Fix merge conflict related to renaming of one of the tests
Regenerate tests affected by previous commit
Fix merge conflict related to renaming of one of the tests
Improve wording of the `-Xuse-k2 -language-version 1.*` CLI warning
Improve wording of LV2.0-specific CLI warnings some more
Fix output of one of the tests for -Xuse-k2 deprecation
Tweak wording of LV2.0-specific CLI warnings
* make it clear in every warning that -Xuse-k2 is deprecated
* add a reminder to remove -Xuse-k2 for `-Xuse-k2 -language-version 2.0`
* add both possibly wanted fixes for `-Xuse-k2 -language-version 1.*`
Remove deprecated -Xuse-k2 flag from one of the tests
Merge-request: KT-MR-8449
Merged-by: Stanislav Ruban <Stanislav.Ruban@jetbrains.com>