Add file system watching option to build options.

Default build option value - disabled.

In Gradle 7 it is enabled by default, and I suspect it causes flaky
build failure when 'TempDir' tries to delete test project.

^KT-45744 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/KGPBaseTest.kt

@@ -45,6 +45,7 @@ abstract class KGPBaseTest {
         val configurationCacheProblems: BaseGradleIT.ConfigurationCacheProblems = BaseGradleIT.ConfigurationCacheProblems.FAIL,
         val parallel: Boolean = true,
         val maxWorkers: Int = (Runtime.getRuntime().availableProcessors() / 4 - 1).coerceAtLeast(2),
+        val fileSystemWatchEnabled: Boolean = false,
     ) {
         fun toArguments(
             gradleVersion: GradleVersion
@@ -76,6 +77,14 @@ abstract class KGPBaseTest {
                 arguments.add("--no-parallel")
             }
 
+            if (gradleVersion >= GradleVersion.version("6.5")) {
+                if (fileSystemWatchEnabled) {
+                    arguments.add("--watch-fs")
+                } else {
+                    arguments.add("--no-watch-fs")
+                }
+            }
+
             return arguments.toList()
         }
     }