Modify maven build to skip tests when building the readthedocs

[shroffk]

addressing #3773

We don't need to run all the unit tests when building documentation

Checklist

• Testing:

  • The feature has automated tests
  • Tests were run
  • If not, explain how you tested your changes

• Documentation:

  • The feature is documented
  • The documentation is up to date
  • Release notes:
    • Added an entry if the change is breaking or significant
    • Added an entry when adding a new feature

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[lcaouen]

Looks good to me.
By the way I'm wondering if there is a maven goal faster than "clean install" to build only the documentation without building all the binaries...