[Tests] Run KMP tests in Analysis API LL FIR test suites

New tests are red in current commit!
All `.ll.kt` files are just copies of `.fir.kt` or `.kt`. This will be
fixed in the next commit to clearly show difference between LL and FIR.

The original purpose of this change was to test
`ACTUAL_ANNOTATIONS_NOT_MATCH_EXPECT` diagnostic, for which FIR checker
will be run only in IDE (to be changed in next MR), so its reports
a lost from usual KMP tests.
But this looks like a useful change for all KMP tests, not only this
diagnostic.

^KT-62559

generators/analysis-api-generator/tests/org/jetbrains/kotlin/generators/tests/analysis/api/firLowLevel.kt

@@ -246,8 +246,6 @@ internal fun TestGroupSuite.generateFirLowLevelApiTests() {
         fun TestGroup.TestClass.modelInit() {
             model(
                 "diagnostics/tests",
-                // MPP tests are not actual for Analysis Api (IDE) infrastructure because it doesn't use IR at all, unlike MPP
-                excludeDirsRecursively = listOf("multiplatform"),
                 excludedPattern = CUSTOM_TEST_DATA_EXTENSION_PATTERN,
                 pattern = KT_OR_KTS,
             )