Filings UI: more package updates + cleanup

[severinbeauvais]

In #15929, Filings UI was updated from Vuex to Pinia.

In THIS ticket, a number of other packages need to be updated (partly to stay up to date with evolving packages and partly in preparation for Vue3). See PR 540 for a similar change made in Create UI.

Se also #16206.

To do:

• [ ] ~array-move instead of array.prototype.move if used~
• [x] lodash.omit if used
• [x] pdfjs-dist (plus update code that uses it)
• [x] additional @types/
• [x] @vue/cli-xxx packages
• [x] @vue/vue2-jest
• [x] eslint + plugins
• [x] ts-jest
• [x] typescript
• [x] any other lesser package updates (minor or patch version changes)
• [x] change import Vue from 'vue' to import { Vue } from 'vue-property-decorator'
• [x] change mixins: [...] toMixins(...)`
• [x] related vue file updates
• [x] alphabetize @Getter and @Actions declarations
• [x] fix property/method visibility in template, if time allows
• [x] remove the readonly from getters
• [x] fix any broken unit tests
• [x] Removed service worker plugin (https://github.com/bcgov/entity/issues/16170)
• [x] Changed Vue.nextTick() to this.$nextTick()

Acceptance criteria:

• npm run lint should not report any errors or warnings (with exceptions for some deprecated features)
• npm run build should not report any errors or warnings (with exceptions for some deprecated features)
• npm run test:unit should report all tests passing

[severinbeauvais]

This is not a Tech Debt ticket -- it's not something we could/should have done earlier and put off until now.

Instead, this is work needed to handle the current/future upgrade to Vue3 (which is an external driver as Vue2 is deprecated).

[JazzarKarim]

Test Notes

• Please test uploading a pdf as the code have been slightly changed there.