Update PULL_REQUEST_TEMPLATE.md: Streamline and require manual system testing

Author: grayside

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,18 +2,23 @@
 
 Fixes #<ISSUE-NUMBER>
 
-Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.
-
 ## Checklist
 
-- [ ] I have followed [Sample Format Guide](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md)
-- [ ] `pom.xml` parent set to latest `shared-configuration`
-- [ ] Appropriate changes to README are included in PR
-- [ ] These samples need a new **API enabled** in testing projects to pass (let us know which ones)
-- [ ] These samples need a new/updated **env vars** in testing projects set to pass (let us know which ones)
+### Testing
+
+- [ ] **I have tested this change on a live environment and verified it works as intended.**
 - [ ] **Tests** pass:   `mvn clean verify` **required**
 - [ ] **Lint**  passes: `mvn -P lint checkstyle:check` **required**
 - [ ] **Static Analysis**:  `mvn -P lint clean compile pmd:cpd-check spotbugs:check` **advisory only**
+
+### Compliance & Style
+
+- [ ] I have followed [Sample Format Guide](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md)
+- [ ] `pom.xml` parent set to latest `shared-configuration`
+- [ ] Appropriate changes to README are included in PR
 - [ ] This sample adds a new sample directory, and I updated the [CODEOWNERS file](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/.github/CODEOWNERS) with the codeowners for this sample
-- [ ] This sample adds a new **Product API**, and I updated the [Blunderbuss issue/PR auto-assigner](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/.github/blunderbuss.yml) with the codeowners for this sample 
+- [ ] This sample adds a new **Product API**, and I updated the [Blunderbuss issue/PR auto-assigner](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/.github/blunderbuss.yml) with the codeowners for this sample
+
+### Post-Approval Actions
+
 - [ ] Please **merge** this PR for me once it is approved