Avoid maven error `Unknown lifecycle phase \"-\"` when the value of a define contains `-`.
Don't split and trim maven arguments. Expect they come in as a list, keep them as list.
This is a breaking change compared to the old Groovy implementation which relied on using a shell for calling maven.
As an example, consider this diff:
```diff
- goals: 'org.apache.maven.plugins:maven-help-plugin:3.1.0:evaluate',
- defines: "-Dexpression=$pomPathExpression -DforceStdout -q",
+ goals: ['org.apache.maven.plugins:maven-help-plugin:3.1.0:evaluate'],
+ defines: ["-Dexpression=$pomPathExpression", "-DforceStdout", "-q"],
```
Disable download logs in Maven by default
This commit adds a flag to Maven by default, which disables the messages
like "Downloading from central".
The logger is set to level "warn", so errors will still be visible, but
successful messages won't clutter logs anymore.
This option is also set by default in the GitLab CI template file for
maven.
See [1] for reference on the option.
1: https://stackoverflow.com/a/35653426/8843830
