Removed unnecessary mock counter and switch during constructors mocking

[Damtev]

Description

Fixes #1878.

How to test

Automated tests

Common pipeline.

Manual tests

The same as in the corresponding issue.

Generated test:

///region Test suites for executable org.utbot.examples.mock.provider.impl.ProviderImpl.provideObject

///region SYMBOLIC EXECUTION: SUCCESSFUL EXECUTIONS for method provideObject()

/**
 * @utbot.classUnderTest {@link ProviderImpl}
 * @utbot.methodUnderTest {@link ProviderImpl#provideObject()}
 * @utbot.returnsFrom {@code return new ExampleClass(0);}
 */
@Test
@DisplayName("provideObject: -> return new ExampleClass(0)")
public void testProvideObject_Return() {
	org.mockito.MockedConstruction mockedConstruction = null;
	try {
		mockedConstruction = mockConstruction(ExampleClass.class, (ExampleClass ExampleClassMock, org.mockito.MockedConstruction.Context context) -> {
		});
		ProviderImpl providerImpl = new ProviderImpl();

		ExampleClass actual = providerImpl.provideObject();

		ExampleClass expectedMock = mock(ExampleClass.class);
		expectedMock.field = 0;
                // org.utbot.examples.mock.service.impl.ExampleClass has overridden equals method
                assertEquals(expectedMock, actual);
	} finally {
		mockedConstruction.close();
	}
}
///endregion

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.