* Avoid changing global state in CI runs II
- move `dotnet` tools into `$PWD/.dotnet/tools/`
- add `dotnet` tools to `$env:PATH`
- install `jq` in `$PWD/.tools/`
- install `nginx` in `$PWD/.tools/nginx/`
nits:
- remove an extra (incorrect) `$env:JAVA_HOME` setting
- build.ps1 finds a local JDK and sets this variable (and `$env:PATH`) properly
- avoid `'$(SELENIUMPROCESSTRACKINGFOLDER)' == '\artifacts\tmp\selenium\'`
- `$(BuildDirectory)` was normally the empty string (w/o fix)
- use `$(BuildDirectory)` a bit more
* Add files. disable artifact / test results publications to avoid warnings on CI
- artifacts/log is often empty when binary logs are disabled
- no tests create *.trx files
- don't have Java test results either
- only test jobs need test results published
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