Improve bug template

[eivindjahren]

After going through the bug reports we have had so far, quite a lot of the placeholder text is kept in place rather than being replaced. In order to avoid clutter, placeholder text is replaced by textareas. You can see these textareas in action in the xarray repo.

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure tests pass locally (after every commit!)

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.42%. Comparing base (bd52a37) to head (f2c6e08).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7884      +/-   ##
==========================================
+ Coverage   85.41%   85.42%   +0.01%     
==========================================
  Files         381      381              
  Lines       23565    23565              
  Branches      887      893       +6     
==========================================
+ Hits        20128    20131       +3     
+ Misses       3330     3327       -3     
  Partials      107      107              

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