Add snapshot test to others generators.

[mshima]

Following #14852.

This PR adds snapshot tests to others generators that don't have regression tests in CI.

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[mshima]

@Tcharl snapshot tests for the others generators.
It took some time but it would be hard to fix regressions in deployments generators.

[Tcharl]

Awesome!
Would it be interesting to generalize snapshot testing? Looks like it will dramatically harden the jhipster tests as well as simplify their maintenance (total coverage can become a no-brainer: one file + all the combinations of options it uses == as many tests).
WDYT?

[mshima]

Would it be interesting to generalize snapshot testing?

Some generators generates too much code, and the files would be too big.

Follow-ups:

• liquibase/changelog generator?
• replace manually created expected files: https://github.com/mshima/generator-jhipster/blob/main/test/utils/expected-files.js with filenames snapshots.
• drop old tests from deployments.

[Tcharl]

Could be nice for liquibase/incremental: I encountered some issues with some ids and relationships.
Big +1 for expected files of course: free food :-)