Normalize tests.

[mshima]

Overview of the feature request

JHipster has very different test patterns that was implemented in different periods.
It has custom helpers that can be used in every test now.

Use:

helpers.runJHipster();
/** Reuse existing context */
helpers.runJHipsterInApplication();
helpers.runJDL();
/** Reuse existing context */
helpers.runJDLInApplication();
helpers.runCli();

See: #27413,

Motivation for or Use Case

Related issues or PR

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