Support new PMD 7 CLI interface

[adangel]

• Refs [core] Use PicoCli and unify PMD usage under a single main pmd#4059

This adds support for thew new PicoCLI based command line. The actual parameters didn't change, but the base command:

• PMD 6: bin/run.sh pmd
• PMD 7: bin/pmd check

[adangel]

Ok, one failing integration test. But that's expected: The test test_build(IntegrationTestPmdReportBuilder) tests creating a regression report for master vs. pmd/7.0.x. It already uses the new command to call pmd7:

/home/runner/work/pmd-regression-tester/pmd-regression-tester/target/pmd-bin-7.0.0-SNAPSHOT-origin_pmd_7.0.x-11763cdc604a8288b0b079f6707ce8eebb53747d/bin/pmd analyze -d target/repositories/checkstyle ...

And therefore fails:

  D, [2022-10-07T10:02:29.225724 #2844] DEBUG -- : status: pid 3923 exit 127
  D, [2022-10-07T10:02:29.225762 #2844] DEBUG -- : stdout: 
  D, [2022-10-07T10:02:29.225787 #2844] DEBUG -- : stderr: sh: 1: /home/runner/work/pmd-regression-tester/pmd-regression-tester/target/pmd-bin-7.0.0-SNAPSHOT-origin_pmd_7.0.x-11763cdc604a8288b0b079f6707ce8eebb53747d/bin/pmd: not found

So, this integration test will be good, once pmd/pmd#4059 is merged.