Use html list for checklist to prevent showing tasks in PR list

[juhoinkinen]

Reasons for creating this PR

PR list shows "2 tasks done" for each PR because the PR description includes two markdown checkboxes:

---

Instead, when a html list is used, tasks won't be shown, e.g. the bottom PR (but this makes the checkboxes non-functional, they cannot be checked by clicking):

Found this out from this discussion.

Link to relevant issue(s), if any

• Closes #

Description of the changes in this PR

Instructions how to test this PR

Known problems or uncertainties in this PR

Is cleaner PR list worth of making the checkboxes non-functional?

Checklist

• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

Disclosure of AI Tool Usage

Please indicate AI use by choosing the most suitable TLP:AI category below and removing the irrelevant categories from the list. AI:ORANGE is the minimum level for merging.

• ⚪ AI:WHITE Written independently, no significant AI involvement.
  Describe the AI tool(s) you used:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.50%. Comparing base (ef35240) to head (008edf7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #113   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files          13       13           
  Lines         536      536           
=======================================
  Hits          528      528           
  Misses          8        8           

Flag	Coverage Δ
unittests	98.50% <ø> (ø)

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