Update State Management Library (Post Vue 3 Migration)

[fergmac]

Describe the task
Vuex is still supported by Vue 3 however long term Pinia is the recommended state management library for Vue 3.

Purpose
This is not a required part of the Vue 3 migration. Potential future proofing depending on where the community goes and what the framework maintainers do longterm with future versions of Vue.

Acceptance Criteria

• State Management Library Vuex is replaced with Pinia

Additional context

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