Add pull request template for release branches

Author: Matejkob

.github/PULL_REQUEST_TEMPLATE/release_branch.md

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+* **Explanation**: <!-- A description of the issue being fixed or enhancement being made. This can be brief, but it should be clear. -->
+* **Scope**: <!-- An assessment of the impact/importance of the change. For example, is the change a source-breaking language change, etc. -->
+* **Issue**: <!-- The GitHub Issue link if the change fixes/implements an issue/enhancement -->
+* **Original PR**: <!-- Pull Request link from main branch -->
+* **Risk**: <!-- What is the (specific) risk to the release for taking this change? -->
+* **Testing**: <!-- What specific testing has been done or needs to be done to further validate any impact of this change? -->
+* **Reviewer**: <!-- One or more code owners for the impacted components should review the change. Technical review can be delegated by a code owner or otherwise requested as deemed appropriate or useful. -->