dx: Clean up PR template

[Pwuts]

There is stuff in the PR template that is not template stuff. It should either be commented out so that it's only visible to the author/editor, or moved to the contribution guide. Or changed into a checklist so it can be used to communicate useful information about the PR, but the longer the template gets, the smaller the chance people will actually fill it out.

[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

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[ntindle]

IMO Add a test plan requirement

[Pwuts]

@ntindle what do you mean exactly?

[ntindle]

As one of the few reviewing PRs right now, it’s hard to know what things interact with and I need to test

[Pwuts]

@ntindle I get that, but what does that mean for this PR? What text do you want to have placed where?

[ntindle]

Swap those sections to writing test plans

[ntindle]

In looking back at this, tbh I like how it is

[Pwuts]

Reasons I don't like this stuff being in the PR template like it is now:

• It's a lot of text, but not relevant for a significant fraction of PRs.
• It doesn't provide any value to read it to anyone but the PR author.
• It isn't a checklist, which would be a much more useful for something like this.
• We're putting basic contribution instructions here, without pointing to any of our more elaborate contribution guides/instructions. This fragmentation isn't good for the contributor experience.

[ntindle]

I think a better move would be converting it to a checklist and adding links to the areas you're discussing