[cypress] Remove unnecessary page visits and be verbose on skipped tests.

[mshima]

• Add copyright headers.
• Remove unnecessary page visits
• Be verbose on skipped tests
• Reduces runtime 20-30%

Related to #14441

---

Please make sure the below checklist is followed for Pull Requests.

• All continuous integration tests are green
• Tests are added where necessary
• jhipster-online was updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

When you are still working on the PR, consider converting it to Draft (bellow reviewers) and adding skip-ci label, you can still see CI build result at your branch.

[pascalgrimaud]

@mshima : I think it is still possible to launch npm run cypress and select each tests to be run individually ?

[pascalgrimaud]

ok, just tested, it works well, excepting another issue with duplicated navbar (for Vue application), with double same entries (I used jhipster entity subgenerator)