Drop test-integration/(scripts/*-samples) in favor of generate-blueprint

[mshima]

Overview of the feature request

• drop test-integration/scripts.
• move test-integration/*-samples into generate-samples templates.
• migrate workflows that depend on test-integration folder to jhipster/actions and generate-samples

Motivation for or Use Case

Related issues or PR

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[LakshitAgarwal]

@Tcharl @mshima may i take this issue?

[LakshitAgarwal]

@Tcharl @mshima please check if this solves