refactor editorAccessibility reducers and actions using redux toolkit

[PiyushChandra17]

Associated issue: #2042

Changes:

• First things first removed all the associated constants
• Used createSlice to rewrite the editorAccessibility reducer
• Exported the automatically generated action creator functions from actions/editorAccessibility.js
• Deleted the existing action creator function

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[raclim]

Thanks for your work on refactoring the reducers and actions to use Redux Toolkit!

I think a few of these PRs aren't passing the tests—would you be able to update those PRs to ensure that they pass them? Thanks!

[PiyushChandra17]

Thanks for your work on refactoring the reducers and actions to use Redux Toolkit!

I think a few of these PRs aren't passing the tests—would you be able to update those PRs to ensure that they pass them? Thanks!

@raclim I'm quite aware that these few PR's aren't passing the tests as it should be, i'll be soon working on it and make sure that they pass the test going forward. Probably I'll update you soon!

[lindapaiste]

You got the mutations right here 👍

[PiyushChandra17]

@lindapaiste Thanks for the feedback, these are really helpful :)