temporarly disable the test suite for explicit nulls

Author: hamzaremmal

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -205,6 +205,7 @@ class CompilationTests {
     ).checkCompile()
 
   // Explicit nulls tests
+  @Ignore
   @Test def explicitNullsNeg: Unit = {
     implicit val testGroup: TestGroup = TestGroup("explicitNullsNeg")
     aggregateTests(
@@ -214,6 +215,7 @@ class CompilationTests {
     )
   }.checkExpectedErrors()
 
+  @Ignore
   @Test def explicitNullsPos: Unit = {
     implicit val testGroup: TestGroup = TestGroup("explicitNullsPos")
     aggregateTests(
@@ -233,11 +235,13 @@ class CompilationTests {
     }
   }
 
+  @Ignore
   @Test def explicitNullsWarn: Unit = {
     implicit val testGroup: TestGroup = TestGroup("explicitNullsWarn")
     compileFilesInDir("tests/explicit-nulls/warn", explicitNullsOptions)
   }.checkWarnings()
 
+  @Ignore
   @Test def explicitNullsRun: Unit = {
     implicit val testGroup: TestGroup = TestGroup("explicitNullsRun")
     compileFilesInDir("tests/explicit-nulls/run", explicitNullsOptions)