Disable non-sample lint checks for non-sample projects in sample lint tasks

Only removes one lint baseline to minimize merge conflicts since we keep
updating baselines globally. Re-enables NewApi for sample project lint.

Fixes: 206852370
Test: ./gradlew :activity:activity-compose:activity-compose-samples:lintDebug
Change-Id: I1a090588029dee9b4641081e06cb3baaaa162b14
diff --git a/buildSrc/lint.xml b/buildSrc/lint.xml
index 12cad2a..5ec6632 100644
--- a/buildSrc/lint.xml
+++ b/buildSrc/lint.xml
@@ -1,5 +1,24 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Please copy any lint rules added here to all other modules local lint.xml files -->
+<!--
+  Copyright 2021 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<!--
+  Please copy any lint rules added here to all other modules local lint.xml
+  files and lint_samples.xml (if applicable).
+   -->
 <lint>
     <issue id="LintBaseline" severity="ignore">
         <ignore regexp=".* filtered out because .* listed in the baseline file.*"/>