EREGCSC-2746 -- Upgrade Vitest front end unit tests in key portions of the code

[PhilR8]

Resolves EREGCSC-2746

Description

In support of our goal of 80% test coverage for all code in codebase, this Pull Request increases coverage in front end Javascript code in the form of unit tests written for Vitest.

This story's Acceptance Criteria specifically lists the following:

• Utilities have good test coverage, according to code review
  • "Utilities" refers to all files located in /solution/ui/regulations/utilities/
  • These files contain reusable utility methods, API methods, and Options API Filter Methods
• Improved coverage for other components that are reused multiple times

This pull request changes:

• Increases Vitest unit test cases from 99 tests to 215 tests

• Increases /solution/ui/regulations/utilities/ test coverage to at least 80% for all coverage metrics

  	Before	Current	Change
  Statment %	67	83	+16
  Branch %	82	92	+10
  Function %	33	83	+50
  Lines %	67	83	+16

• Increases overall front end Javascript test coverage

  	Before	Current	Change
  Statment %	28	33	+5
  Branch %	70	79	+9
  Function %	35	53	+18
  Lines %	28	33	+5

Steps to manually verify this change:

1. Green check marks
2. Run Vitest locally
   • make test.vitest.ui
3. All Vitest test pass and coverage metrics match percentages above to the nearest percent

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