Create a CCC release process issue template
## Problem/motivation
Follow-up from:
#3586321+s
It would be useful to have an issue template for the release process.
## Solution
Make this into an issue template:
- [ ] Finish all issues from the release planning and milestone, e.g. #3586182+
- [ ] Run a code review (at least a security review) for major issues, e.g. #3586294+
- [ ] Resolve any blockers from the code review
- [ ] Code freeze
- [ ] Run manual QA, e.g. #3586296+
- [ ] Resolve any blockers from QA
- [ ] Re-run security review if there were changes
- [ ] Re-run QA if there were changes
- [ ] Code freeze
- [ ] Move closed issues from future milestone to current (e.g. beta4 to beta3)
- [ ] Audit contributors (code is happening here: #3586222+)
- [ ] Create release notes (code is happening here: #3586222+)
- [ ] Create release, e.g. #3586295+
- [ ] Create post-release promotion issues, e.g. #3577657+, #3586154+
- [ ] Create recruit testers issue, e.g. #3586235+
- [ ] Announce in various Slack channels
issue