APPEALS-51536: Optimize automatic case distribution tests

[craigrva]

Resolves APPEALS-51536

Description

• Consolidates feature tests from multiple tests and files in spec/feature/automatic_case_distribution into a single file in spec/feature/case_distribution_levers to follow repository naming convention and reduce the number of feature tests being run
• Adds a jest snapshot for the caseDistributionApp component
• Moves feature test validating that non-admin users cannot modify values on /case-distribution-levers to the jest test for efficiency

Acceptance Criteria

• Code compiles correctly
• No tests failing

[codeclimate]

Code Climate has analyzed commit 90c207b and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Performance	1

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