Improve issue templates & add PR template (#7051)

* improved feature suggestion template

* added test case chapter to bug report template

* PR wording

* added PR template

* improved formatting in issue template

* removed checkbox for concept due to new GH discussions process

* improved wording

* improved PR todo list

* amended PR checklist; minor rewording

* removed duplicate wording

* add securtiy check section to contribution guide

.github/ISSUE_TEMPLATE/---1-report-an-issue.md

@@ -8,7 +8,11 @@ assignees: ''
 ---
 
 ### New Issue Checklist
-<!-- Please check the following boxes [ ] -> [x] before submitting your issue. Click the "Preview" tab for better readability. Thanks for reporting issues back to Parse Server! -->
+<!--
+    Please check the following boxes [x] before submitting your issue.
+    Click the "Preview" tab for better readability.
+    Thanks for contributing to Parse Server!
+-->
 
 - [ ] I am not disclosing a [vulnerability](https://github.com/parse-community/parse-server/blob/master/SECURITY.md).
 - [ ] I am not just asking a [question](https://github.com/parse-community/.github/blob/master/SUPPORT.md).
@@ -27,6 +31,16 @@ assignees: ''
 ### Expected Outcome
 <!-- What outcome, for example query result, did you expect? -->
 
+### Failing Test Case / Pull Request
+<!--
+    Check one of the following boxes [x] if you added a PR and add the link.
+    See the contribution guide for how add a test cases:
+    https://github.com/parse-community/parse-server/blob/master/CONTRIBUTING.md
+-->
+
+- [ ] 🤩 I submitted a PR with a fix and a test case.
+- [ ] 🧐 I submitted a PR with a failing test case.
+
 ###  Environment
 <!-- Be specific with versions, don't use "latest" or semver ranges like "~x.y.z" or "^x.y.z". -->