Add disclaimer of generating Spring integration tests

[Vassiliy-Kudryashov]

Description

These changes warn users about potentially harmful activity during generation "Integration tests"

Fixes #2609

How to test

Manual tests

Choose "Integration tests" in "Generate..." dialog. For both "Generate" and "Generate and Run" there should be disclaimer dialog describing potentially dangerous operation.

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.