Add script to run androidx_host_tests with custom AGP and Lint

Bug: 197228092
Test: ./androidx-studio-integ-host-tests.sh
Change-Id: I51d9df94936d04a07e4d1f9287f8099938d703e0
diff --git a/buildSrc/settings.gradle b/buildSrc/settings.gradle
index c613f21..28bcb0f 100644
--- a/buildSrc/settings.gradle
+++ b/buildSrc/settings.gradle
@@ -27,6 +27,11 @@
                 logger.warn("Using custom version ${agpOverride} of AGP due to GRADLE_PLUGIN_VERSION being set.")
                 version('androidGradlePlugin', agpOverride)
             }
+            def lintOverride = System.getenv("LINT_VERSION")
+            if (lintOverride != null) {
+                logger.warn("Using custom version ${lintOverride} of Lint due to LINT_VERSION being set.")
+                version('androidLint', lintOverride)
+            }
         }
     }
-}
\ No newline at end of file
+}