`target/generated-test-sources` is suggested in UI dialog as Test sources root

[alisevych]

Description

target/generated-test-sources is shown on UI as Test sources root

To Reproduce

1. Run IntelliJ Idea Ultimate 2022.3.3
2. Install plugin IU built from unit-test-bot/rc2023.3 branch
3. Create a Maven project with JDK 17
4. Add a sample Java class to it
5. Generate and Run tests
6. Open UnittestBot dialog again
7. Expand Test sources root

Expected behavior

Only test sources roots of the project and suggestion to create .../src/test/utbot_tests should be displayed.

Actual behavior

target/generated-test-sources is also displayed in the Test sources root suggestions.

Visual proofs (screenshots, logs, images)

Environment

Windows 10 Pro
IntelliJ IDEA 2022.3.3
Maven, JDK 17