Let concrete add additional mocks to UtCompositeModel created by the engine

[IlyaMuravjov]

Description

Fixes #2549

#2549 shows that symbolic engine may miss some mocks. I suspect that it happens when it doesn't fully execute the method symbolically and lets concrete execution to finish the execution.

Regardless of why symbolic engine misses mocks, we need to deal with missed mocks. This PR makes concrete execution to always use the mechanism for dealing with incomplete mock that was originally developed for dealing with mocks created by the fuzzer (see #2529).

NOTE: generateMockitoAnswerHandlingRedundantAndMissingMocks() should be reviewed before approving this PR.

How to test

Automated tests

The proposed changes are verified with tests:
utbot-framework-test/src/test/kotlin/org/utbot/examples

Manual tests

Issue #2549 should no longer reproduce (NOTE: I wasn't able to reproduce it even before this fix).

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.

[sergeypospelov]

LGTM