Update GoTimeUtilTest.java

[kushagrasinha123ks]

Description

Refactored GoTimeUtilTest to avoid directly calling Optional.get(). Now, the test checks whether the Optional contains a value before fetching it.

Fixes eclipse-jkube#2970

• GoTimeUtilTest is refactored to not directly call Optional.get()
• GoTimeUtilTest is passing after making these changes

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• I have read the contributing guidelines
• I signed-off my commit with a user that has signed the Eclipse Contributor Agreement
• My code follows the style guidelines of this project
• I Keep It Small and Simple: The smaller the PR is, the easier it is to review and have it merged
• I use conventional commits in my commit messages
• I have performed a self-review of my code
• I Added CHANGELOG entry
• I have updated the documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I tested my code in Kubernetes
• I tested my code in OpenShift

git config user.name "Kushagra Sinha"
git config user.email "kushagrasinha123ks@gmail.com"
git commit --amend --signoff
git push origin kushagra/issue#2970 -f