Kotlin: mark kotlin1 integration tests

Mark the integration tests that require a Kotlin 1.x language version
with @pytest.mark.kotlin1 so CI can run them on a pinned pre-2.4
compiler (Kotlin 2.4 no longer accepts -language-version 1.9).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

java/ql/integration-tests/kotlin/all-platforms/enhanced-nullability/test.py

@@ -1,6 +1,9 @@
 import pathlib
 
+import pytest
 
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     java_srcs = " ".join([str(s) for s in pathlib.Path().glob("*.java")])
     codeql.database.create(

java/ql/integration-tests/kotlin/all-platforms/external-property-overloads/test.py

@@ -1,6 +1,9 @@
 import commands
 
+import pytest
 
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     commands.run("kotlinc -language-version 1.9 test.kt -d lib")
     codeql.database.create(command="kotlinc -language-version 1.9 user.kt -cp lib")

java/ql/integration-tests/kotlin/all-platforms/extractor_information_kotlin1/test.py

@@ -1,2 +1,6 @@
+import pytest
+
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     codeql.database.create(command="kotlinc -J-Xmx2G -language-version 1.9 SomeClass.kt")

java/ql/integration-tests/kotlin/all-platforms/file_classes/test.py

@@ -1,6 +1,9 @@
 import commands
 
+import pytest
 
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     commands.run("kotlinc -language-version 1.9 A.kt")
     codeql.database.create(command="kotlinc -cp . -language-version 1.9 B.kt C.kt")

java/ql/integration-tests/kotlin/all-platforms/java-interface-redeclares-tostring/test.py

@@ -1,6 +1,9 @@
 import commands
 
+import pytest
 
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     commands.run(["javac", "Test.java", "-d", "bin"])
     codeql.database.create(command="kotlinc -language-version 1.9 user.kt -cp bin")

java/ql/integration-tests/kotlin/all-platforms/kotlin_java_lowering_wildcards/test.py

@@ -1,6 +1,9 @@
 import commands
 
+import pytest
 
+
+@pytest.mark.kotlin1
 def test(codeql, java_full):
     # Compile the JavaDefns2 copy outside tracing, to make sure the Kotlin view of it matches the Java view seen by the traced javac compilation of JavaDefns.java below.
     commands.run(["javac", "JavaDefns2.java"])