UnnecessaryImportRule - check also the usage in static imports

[komasztania]

Describe the bug
When the imported class is used as the element of the static import, there is the issue.
It is false.

To Reproduce
Sample file attached: SampleAttributeEnhancement.gsx

Expected behavior
When the class is also used in the static imports, there should be no issue.

Screenshots

Software Versions

• SonarScanner Version: 4.7.0.2747
• SonarQube Version: 8.9.10
• Plugin Version: sonar-communitygosu-plugin-1.2.2.jar