tests: reformat error messages to avoid tripping MSBuild

Change the format of error messages sent to stderr from tests and test
servers. As a workaround to avoid triggering Visual Studio's MSBuild
tool's built-in regexp matcher, and making it mark builds failed for
reasons we don't want them to hard fail.

Roughly, the pattern to avoid is the word "error" (case-insensitive)
in the same line with a colon `:`.

It affected GHA/windows MSVC CI jobs, causing flakiness:
```
CUSTOMBUILD : fopen() failed with error : 13 Permission denied [D:\a\curl\curl\bld\tests\test-ci.vcxproj]
  Error opening file: log/4/smtp_sockfilt.log
[...]
CUSTOMBUILD : fopen() failed with error : 13 Permission denied [D:\a\curl\curl\bld\tests\test-ci.vcxproj]
  Error opening file: log/8/imap_sockfilt.log
  Msg not logged: 00:18:10.656000 > 178 bytes data, server => client
[...]
  TESTDONE: 1629 tests out of 1634 reported OK: 99%
  Building Custom Rule D:/a/curl/curl/tests/CMakeLists.txt
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(254,5): error MSB8066: Custom build for 'D:\a\curl\curl\bld\CMakeFiles\621f80ddbb0fa48179f056ca77842ff0\test-ci.rule;D:\a\curl\curl\tests\CMakeLists.txt' exited with code -1. [D:\a\curl\curl\bld\tests\test-ci.vcxproj]
Error: Process completed with exit code 1.
```
Ref: https://github.com/curl/curl/actions/runs/13643149623/job/38137076210?pr=16490#step:14:3125
Ref: https://github.com/curl/curl/actions/runs/13688765792/job/38277961720?pr=16582#step:14:1717

The `IgnoreStandardErrorWarningFormat="true"` MSBuild Exec option
controls this behavior:
https://learn.microsoft.com/visualstudio/msbuild/exec-task#parameters
I couldn't figure out a way to apply it to CMake builds.

MSBuid pattern matching rules:
https://github.com/dotnet/msbuild/blob/353c0f3d37957cc98bfa6a76b568d70d12193fc3/src/Shared/CanonicalError.cs
https://learn.microsoft.com/visualstudio/msbuild/msbuild-diagnostic-format-for-tasks

Note: There may be further error messages output from runtests scripts,
that use this format, which are not explicitly fatal. They may need
future fixes.

Thanks-to: Dion Williams
Ref: https://github.com/curl/curl/discussions/14854#discussioncomment-12382190
Ref: https://github.com/curl/curl/discussions/14854#discussioncomment-12395224

Closes #16583
14 files changed
tree: 9dcd4d3577ae398f9ecfbc1360cb8a25a3f9b422
  1. .circleci/
  2. .github/
  3. CMake/
  4. docs/
  5. include/
  6. lib/
  7. LICENSES/
  8. m4/
  9. packages/
  10. plan9/
  11. projects/
  12. scripts/
  13. src/
  14. tests/
  15. winbuild/
  16. .dir-locals.el
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .mailmap
  21. acinclude.m4
  22. appveyor.sh
  23. appveyor.yml
  24. buildconf
  25. CHANGES.md
  26. CMakeLists.txt
  27. configure.ac
  28. COPYING
  29. curl-config.in
  30. Dockerfile
  31. GIT-INFO.md
  32. libcurl.pc.in
  33. Makefile.am
  34. README
  35. README.md
  36. RELEASE-NOTES
  37. renovate.json
  38. REUSE.toml
  39. SECURITY.md
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