Moves from vuex to pinia

[karynemayer]

Fixes #537

Description

This PR replaces vuex with pinia.

• All stores have been updated
• All store usage has been updated
• All unit tests have been updated

Other relevant changes:

• Changes declare module '@vue/runtime-core' to the new declara module 'vue', since runtime-core is now included and its usage is not recommended on applications, as mentioned here
• Removed axios from globals to avoid tight coupling
• I replaced the use of shallowMount() to a mount() specifying a stub for the child component due to an error caused specifically by the shallowMount() usage that has been around since vue v3.2.32. See screenshot of the error

Use node 20+ to build

Test scenarios

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have cleaned up the code in the areas my change touches
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings
• [x] I have removed any unnecessary console messages
• [ ] I have included all english text to the translation file and/or created a new issue with the required translations for the currently supported languages
• [ ] I have tested for mobile functionality and responsiveness
• [x] I have added appropriate test coverage
• [ ] I have updated relevant documentation and/or opened a separate issue to cover the updates (Issue URL: )

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