Improve Test Coverage - EntityStatColumn, CiCdToolTest, SubGenEventTypeTest

[KaziNizamul]

Task Description:
This PR is an attempt to increase some code coverage percentage.
I added a few test cases, which made some improvement in the code coverage i.e. 78% -> 80%.

Screenshots:

Earlier	Now

Affected Files:

• src/main/java/io/github/jhipster/online/domain/enums/EntityStatColumnTest.java
• src/main/java/io/github/jhipster/online/domain/enums/SubGenEventTypeTest.java
• src/main/java/io/github/jhipster/online/service/enums/CiCdToolTest.java

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ KaziNizamul
❌ Nizamul Kazi

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