Add Modified Files Coverage and Checks Publisher

[fo-code]

I added Modified Files Coverage support and a new Coverage Checks Publisher including tests for it.
Also, I renamed "Change Coverage" to "Modified Lines Coverage".

Example layout for the Checks Overview:

[uhafner]

I will continue the review tomorrow with the checks publisher and the tests...

[uhafner]

While looking at the results I think I made a mistake here. When I am developing a PR normally I am interested in the coverage of my changes.

That means we need the totals (this is already working correctly):

• coverage overall project
• changed files
• changed lines

But when looking at the delta we need:

• delta overall project - delta overall reference (typically not interesting for large projects)
• delta changed files - delta changed files reference (how is the coverage of the changed files affected)? Currently we check how it changes with respect to the overall coverage.
• delta changed lines: here I am not sure whether it makes more sense to compare vs. the whole project or the changed files. What do you think? Or do we need both?

[fo-code]

Yes, that makes sense.
Regarding the delta changed lines: I guess we should compare only against the modified files coverage. The whole project has modules with higher and with lower coverage. When we compare the changes of a module with lower coverage against the whole project, there will be a negative trend, even if the modified files are covered quiet good compared to the rest of their module. Therefore, comparing against the changed files would keep the context hence it more accurate, in my opinion.

[uhafner]

I finally managed it to publish a check: https://github.com/uhafner/codingstyle/pull/716/checks?check_run_id=11653892776

[uhafner]

Maybe we should also exclude things totally that are not available (as done in the summary). Otherwise it looks a little bit weird with all the n/a:

[uhafner]

While trying to fix the display of the changes table I am wondering what information we should show actually?

There are several ways:

• The files table shows all files, the changed files table shows only changed files while displaying the whole source code, the changed lines table shows also all changed files while displaying the changed source code only.
• The files table shows all files and has a toggle (or filter by column) that shows only modified files. The changed lines table shows all changed files while displaying the changed source code only.
• Or any other options that make sense?

Possible UI control:

[fo-code]

Maybe we should also exclude things totally that are not available (as done in the summary). Otherwise it looks a little bit weird with all the n/a:

Yes, we should do that. n/a only distracts from what is important.

While trying to fix the display of the changes table I am wondering what information we should show actually?

There are several ways:

* The files table shows all files, the changed files table shows only changed files while displaying the whole source code, the changed lines table shows also all changed files while displaying the changed source code only.

* The files table shows all files and has a toggle (or filter by column) that shows only modified files. The changed lines table shows all changed files while displaying the changed source code only.

* Or any other options that make sense?

Possible UI control:

I suggest the second option - that sounds good. By default, we should show only the changed files in my opinion, since most of the time, that's what is interesting - like it is in the screenshot.

[uhafner]

I think the PR is now ready to be integrated. I'll track the remaining tasks in #512.