Refactor to MirageJS

[minkimcello]

Motivation

This is part of an on-going initiative to completely migrate all of folio-org projects from @bigtest/mirage to miragejs.

@bigtest/mirage was originally a prototype to make mirage available to any framework, but it has since been archived in favor of miragejs. The documentation for miragejs is not only prodigious for its extensive API docs but also for its tutorials and guides. Furthermore, it receives regular bug-fixes and maintenance releases in thanks to its extremely large and active community.

Previous PR: @folio-org/ui-calendar #280
Linking the previous pull request so that subsequent ones can be found tagged below.

Overview of progress at the time of the creation of this PR (in chronological order):

✅ ui-checkin
☑️ ui-checkout
☑️ ui-circulation
☑️ ui-calendar
☑️ ui-agreements

Approach

• Cloned, installed, and then ran tests to double check that the tests are passing before refactoring.
• Removed @bigtest/mirage and added inflected, faker, and miragejs as dev dependencies.
• Configured miragejs as the server type for setupStripesCore().
• Ran tests after the refactor to confirm they all pass.

[sonarcloud]

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