Merge pull request #5022 from tariq1890/issue_tpl

Renaming Issue Templates correctly and adding a pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+**What this PR does / why we need it**:
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+**Special notes for your reviewer**:
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+**If applicable**:
+- [ ] this PR contains documentation
+- [ ] this PR contains unit tests
+- [ ] this PR has been tested for backwards compatibility