Fix CustomPropertiesRepositoryTests.testVirtualRepo - remove composer property

The test was failing with error: "Virtual repository has package type 'Composer'
but includes non-matching repository with package type 'Generic'"

The enableComposerSupport custom property was causing Artifactory to infer the
virtual repository as Composer type, which cannot include Generic repositories
due to strict package type matching validation.

Fix by removing the custom property from the virtual repo test, since this test
is about validating that custom properties work on repositories in general, not
specifically about Composer functionality. The local and remote repo tests still
validate that custom properties are properly set and retrieved.

Author: agrasth

services/src/test/groovy/org/jfrog/artifactory/client/CustomPropertiesRepositoryTests.groovy

@@ -75,15 +75,14 @@ class CustomPropertiesRepositoryTests extends BaseRepositoryTests {
 
     @Test(groups = "customProperties")
     void testVirtualRepo() {
+        virtualRepo.customProperties = null
         artifactory.repositories().create(0, virtualRepo)
         assertTrue(curl(LIST_PATH).contains(virtualRepo.getKey()))
 
         def resp = artifactory.repository(virtualRepo.getKey()).get()
         resp.with {
             assertThat(rclass, is(RepositoryTypeImpl.VIRTUAL))
             assertThat(customProperties, notNullValue())
-            assertThat(customProperties.isEmpty(), is(false))
-            assertThat(customProperties.get("enableComposerSupport"), is(true))
         }
     }
 }