Run warm up test before running default tests

[lwronski]

In the first run of the test, the output may be polluted by staff downloading, like this:

Downloading https://repo1.maven.org/maven2/org/scala-lang/scala-library/maven-metadata.xml
[4410](https://github.com/VirtusLab/scala-cli/actions/runs/3523852928/jobs/5908513925#step:4:4411)
Downloaded https://repo1.maven.org/maven2/org/scala-lang/scala-library/maven-metadata.xml
[4411](https://github.com/VirtusLab/scala-cli/actions/runs/3523852928/jobs/5908513925#step:4:4412)
Downloading https://repo1.maven.org/maven2/org/scala-lang/scala3-library_3/maven-metadata.xml
[4412](https://github.com/VirtusLab/scala-cli/actions/runs/3523852928/jobs/5908513925#step:4:4413)
Downloaded https://repo1.maven.org/maven2/org/scala-lang/scala3-library_3/maven-metadata.xml
[4413](https://github.com/VirtusLab/scala-cli/actions/runs/3523852928/jobs/5908513925#step:4:4414)
Downloading https://github.com/VirtusLab/scala-cli-scala-versions/raw/main/scala-versions-v1.json
[4414](https://github.com/VirtusLab/scala-cli/actions/runs/3523852928/jobs/5908513925#step:4:4415)
Downloaded https://github.com/VirtusLab/scala-cli-scala-versions/raw/main/scala-versions-v1.json

to clean this up, I added a warm-up test to DefaultTests.

To prevent CI fail such as this error.