[ric-oliv]

The Build step writes a detailed MSBuild text log next to the binlog and uploads both. On macOS that text log is 1.9 GB, and nothing reads it:

• No script, workflow or doc in the repo uses build.log or msbuild.log.
• The binlog has the same content. I regenerated the text log from the macOS binlog of ci: measure the round 4 CI changes together (do not merge) #5788 and compared it with the CI file. Both have the same 216 warning lines and 122 distinct warnings, and no errors. They only differ in how item metadata is formatted.
• If someone wants the text, dotnet msbuild build.binlog -flp:logfile=build.log writes it again in a few seconds.

Writing it isn't free either. Replaying that binlog with the text logger took 6.4 seconds on my Mac, against 1.7 without it, and Upload build logs takes 9 to 20 seconds per leg.

This PR drops the text log and keeps the binlogs:

• the Build step in every .NET leg,
• the MSBuild job,
• integration-test/common.ps1, whose log was never uploaded.

Measured on the first run, against #5790's run from the same evening, which still writes the text log:

Upload build logs	#5790	This PR
macOS	16 s	3
linux-x64	16	2
linux-arm64	10	3
linux-musl-x64	13	2
linux-musl-arm64	12	3
win-x64	14	3
win-arm64	15	3

That's about 10 to 13 seconds per leg. The binlogs still upload, and the log artifacts went from 54 to 119 MB on #5788 to 13 to 33 MB.

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.11%. Comparing base (b41b96c) to head (11f9760).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5792      +/-   ##
==========================================
- Coverage   76.13%   76.11%   -0.02%     
==========================================
  Files         528      528              
  Lines       19579    19579              
  Branches     3829     3829              
==========================================
- Hits        14906    14903       -3     
- Misses       3791     3793       +2     
- Partials      882      883       +1     

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