Avoid collecting useless models in SpringTestClassModelBuilder

[EgorkaKulikov]

Description

When we implemented models traverser in February, we collected some of them just "to have". Now we realised that it is useless.

How to test

Automated tests

Standard Spring tests pipeline

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.