Plugin Action stays locked even when previous generation is finished

[alisevych]

Description

Plugin Action stays locked even when previous generation is finished

To Reproduce

1. Run the 'UTBotJava' project in IntelliJ Idea
2. Both Fuzzing and Symbolic analysis are enabled (File -> Settings -> Tools -> UnitTestBot)
3. UnitTestBot plugin is installed from main
4. Open/create another project
5. Generate tests with UnitTestBot... for a class
6. Wait tests are generated
7. Try to open Generate Tests with UnitTestBot... once again - for any class/method/package

Expected behavior

Plugin action is supposed to be locked only during test generation.

Actual behavior

Plugin action stays locked even when previous generation is finished.

Visual proofs (screenshots, logs, images)

Environment

Windows 10 Pro
IntelliJ IDEA 2022.1.4 (JBR 11)