Migrate two environment tests from karma to jest

What does this MR do?

This moves the specs for the EvironmentsTable and EnvironmentsItem to Jest from Karma. It is a predecessor MR so that the tests to be added in !20372 (merged) can be in Jest.

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.