Excavator: Ensure consistent PULL_REQUEST_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+## What happened?
+
+<!--
+Describe what you've observed and why it's bad (please include whatever stacktraces/version numbers you can).
+Clear steps to reproduce the behaviour are always helpful too!
+-->
+
+## What did you want to happen?
+
+<!--
+Suggest better behaviour
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+## Before this PR
+<!-- What's wrong with the current state of the world and why change it now? -->
+
+## After this PR
+==COMMIT_MSG==
+<!-- User-facing outcomes this PR delivers -->
+==COMMIT_MSG==
+
+## Possible downsides?
+<!-- Please describe any way users could be negatively affected by this PR. -->
+