ci: add a pull request template

Let's get rid of the checklist that is present in the org's template.

Signed-off-by: Miguel Duarte Barroso <[email protected]>

.github/pull_request_template.md

@@ -0,0 +1,21 @@
+<!--  Thanks for sending a pull request!  Here are some tips for you:
+1. Consider creating this PR as draft: https://github.com/kubevirt/kubevirt/blob/main/CONTRIBUTING.md#consider-opening-your-pull-request-as-draft
+2. Follow the instructions for writing a release note from k8s: https://git.k8s.io/community/contributors/guide/release-notes.md
+-->
+
+**What this PR does / why we need it**:
+
+**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
+Fixes #
+
+**Special notes for your reviewer**:
+
+**Release note**:
+<!--  Write your release note:
+1. Enter your extended release note in the below block. If the PR requires additional action from users switching to the new release, include the string "action required".
+2. If no release note is required, just write "NONE".
+-->
+```release-note
+
+```
+