Reorganize spec tests infrastructure code

- Add the tests mute system for the diagnostic tests
- Move the code for the test info parsing to the separate package `parsers`
- Unification of the `linked` and `not linked` spec tests
- Package structure is refactored
- Change the multiline comment format with a test information
- Actualize `PrintSpecTestsStatistic`
- Other different code improvements

compiler/tests-spec/testData/psi/templates/_layout/notLinkedTestsLayout.kt

@@ -1,9 +1,9 @@
 /*
- KOTLIN NOT LINKED PSI SPEC TEST (<!TEST_TYPE!>)
-
- SECTION: <!SECTION!>
- CATEGORIES: <!CATEGORIES!>
- NUMBER: <!TEST_NUMBER!>
- DESCRIPTION: <!TEST_DESCRIPTION!>
- NOTE: this test data is generated by FeatureInteractionTestDataGenerator. DO NOT MODIFY CODE MANUALLY!
+ * KOTLIN NOT LINKED PSI SPEC TEST (<!TEST_TYPE!>)
+ *
+ * SECTION: <!SECTION!>
+ * CATEGORIES: <!CATEGORIES!>
+ * NUMBER: <!TEST_NUMBER!>
+ * DESCRIPTION: <!TEST_DESCRIPTION!>
+ * NOTE: this test data is generated by FeatureInteractionTestDataGenerator. DO NOT MODIFY CODE MANUALLY!
  */