Move issue template user instructions into comments

[kouralex]

This PR changes issue template instructions into comments so that they will not be shown in the actual issue.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.70%. Comparing base (12af8f3) to head (e28ae84).
⚠️ Report is 786 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1679   +/-   ##
=========================================
  Coverage     70.70%   70.70%           
  Complexity     1651     1651           
=========================================
  Files            33       33           
  Lines          4332     4332           
=========================================
  Hits           3063     3063           
  Misses         1269     1269           

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