Public constructor is ignored in tests generated by Fuzzer

[alisevych]

Description

Public constructor is ignored in tests generated by Fuzzer.

To Reproduce

1. Install plugin built from main in IntelliJ IDEA
2. Open spring-petclinic project
3. Copy Recursion Java class from utbot-sample
4. Paste it into org/springframework/samples/petclinic/model in spring-petclinic
5. Set Fuzzing 100% in File -> Settings -> Tools -> UnitTestBot
6. Generate tests for Recursion$factorial

Expected behavior

Recursion class is public and should be instantiated without reflection, just with new T()

Actual behavior

UtUtils.createInstance method is used to instantiate Recursion in all Fuzzing generated tests.

Screenshots, logs

	///region FUZZER: SUCCESSFUL EXECUTIONS for method factorial(int)

	/**
	 * @utbot.classUnderTest {@link Recursion}
	 * @utbot.methodUnderTest {@link Recursion#factorial(int)}
	 */
	@Test
	@DisplayName("factorial: n = positive (mutated from -2147483647) -> return 1")
	public void testFactorialReturnsOne() throws Exception {
		Recursion recursion = ((Recursion) createInstance("org.springframework.samples.petclinic.model.Recursion"));

		int actual = recursion.factorial(1);

		assertEquals(1, actual);
	}

Environment

IntelliJ IDEA version - Ultimate 2023.2
Project - spring-petclinic
JDK - 17

Additional context

If symbolic execution is on, tests generated with symbolic engine have correct instantiation with direct constructor call:

    ///region SYMBOLIC EXECUTION: SUCCESSFUL EXECUTIONS for method factorial(int)

    /**
     * @utbot.classUnderTest {@link Recursion}
     * @utbot.methodUnderTest {@link Recursion#factorial(int)}
     * @utbot.executesCondition {@code (n == 0): False}
     * @utbot.invokes {@link Recursion#factorial(int)}
     * @utbot.triggersRecursion factorial, where the test return from: {@code return 1;}
     * @utbot.returnsFrom {@code return n * factorial(n - 1);}
     */
    @Test
    @DisplayName("factorial: -> return 1")
    public void testFactorial_NNotEqualsZero() {
        Recursion recursion = new Recursion();

        int actual = recursion.factorial(1);

        assertEquals(1, actual);
    }