Update PR template

[jimmyfagan]

JIRA Ticket: BB2-3303

What Does This PR Do?

Minor updates to template to match what I rolled out in other BB2 repos.

What Should Reviewers Watch For?

If you're reviewing this PR, please check for these things in particular:

Validation

What Security Implications Does This PR Have?

Please indicate if this PR does any of the following:

• Adds any new software dependencies

• Modifies any security controls

• Adds new transmission or storage of data

• Any other changes that could possibly affect security?

• [ ] Yes, one or more of the above security implications apply. This PR must not be merged without the ISSO or team security engineer's approval.

Any Migrations?

• [ ] Yes, there are migrations
  • [ ] The migrations should be run PRIOR to the code being deployed
  • [ ] The migrations should be run AFTER the code is deployed
  • [ ] There is a more complicated migration plan (downtime, etc)
• [ ] No migrations