Plugin action is not available in context menu for GO-files

[alisevych]

Description

When Experimental language support is turned on in UTBot settings,
the action is still disabled in context menu in Project view with GO-files.

To Reproduce

1. Run the 'utbot' project in IntelliJ Idea 2022.2.4
2. Install one of the latest plugin builds from main, used this one
3. Open File -> Settings -> Tools -> UnitTestBot
4. Check Experimental languages support
5. Open utbot-go/go-samples/simple/samples.go in Project view, right-click on a GO-file

Expected behavior

Generate Tests with UnitTestBot... action should be enabled.

Actual behavior

Generate Tests with UnitTestBot... action is disabled.
Shortcut is working.

Visual proofs (screenshots, logs, images)

Environment

Windows 10 Pro
IntelliJ IDEA 2022.2.4 Ultimate

Additional context

Please check how it is made in JS and Python modules.