[core] Cleanup issues body

[romgrk]

Closes #10340

Remove the checkboxes from new issues' body. I have hardcoded the strings, seems good enough.

Result: https://github.com/romgrk/mui-test-issue-cleanup/issues/3

[romgrk]

Github seems to store newlines using windows conventions.

[mui-bot]

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Updated pages

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These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	-212.3	67.7	-212.3	-104.7	98.986
Sort 100k rows	ms	719.4	1,398.5	1,310.6	1,187.92	241.02
Select 100k rows	ms	618.1	767.3	683.9	681.68	51.151
Deselect 100k rows	ms	121.9	242.1	158.8	171.78	42.85

Generated by 🚫 dangerJS against b435ed1

[Janpot]

I have hardcoded the strings, seems good enough.

Would it work if we add

  - type: markdown
    attributes:
      value: <!-- delete:start -->

  # checkboxes ...

  - type: markdown
    attributes:
      value: <!-- delete:end -->

And postprocess them with

const body = issue.data.body
  .replaceAll('<!-- delete:start -->', '<!--')
  .replaceAll('<!-- delete:end -->', '-->')

Doesn't seem much more complicated, it doesn't have to be kept in sync with the template strings, and directly reusable in other templates.

[Janpot]

Works for me. Commented with an alternative implementation. But fine to merge as is as well.

[romgrk]

That's a neat idea, but we often edit issues main comment along the way, and leaving those comments in there would still be a bit annoying. But it's trivial to update in the future so I'll merge as is for now.

[Janpot]

That's a neat idea, but we often edit issues main comment along the way, and leaving those comments in there would still be a bit annoying.

Perhaps then we could do

const body = issue.data.body.replaceAll(/<!-- delete:start -->(\n|.)*?<!-- delete:end -->/g, '')

?

I think we still should combine the headers. And did you give this some thought? My personal feeling is that the solution in this PR is the least favourable of the shaping page.