Update GitHub release checklist

[rly]

• Add a step to manually run all tests before merging
• Minor updates to other steps
• Make consistent with HDMF release checklist

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.04%. Comparing base (6e946da) to head (26fff10).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #178 +/- ## ======================================= Coverage 86.04% 86.04% ======================================= Files 5 5 Lines 1161 1161 Branches 288 288 ======================================= Hits 999 999 Misses 107 107 Partials 55 55 ```

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