Fix coverage workflow and update GH templates

[rly]

1. Fixed a typo in the coverage workflow that prevented it from being run.
2. Fixed bug in the workflows preventing the package version from being detected.
3. Simplified GH templates a bit and aligned them with those used by HDMF.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.73%. Comparing base (f00c50c) to head (a0eab94).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #250   +/-   ##
=======================================
  Coverage   86.73%   86.73%           
=======================================
  Files           5        5           
  Lines        1206     1206           
  Branches      229      229           
=======================================
  Hits         1046     1046           
  Misses        102      102           
  Partials       58       58           

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