chore: Add subscript to issue templates

[opentelemetrybot]

Adds a subscript to issue templates to provide guidance for end-users and others to interact with issues in a measurable way. This follows recommendations outlined in the maintainer guide for managing popular issues.

cc @danielgblanco

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (16979f6) to head (e905e03).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2966   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files         188      188           
  Lines        9288     9288           
  Branches     1905     1905           
=======================================
  Hits         8344     8344           
  Misses        944      944           

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