mrc-4609 Allow user to filter unlabelled sessions from view

[EmmaLRussell]

Adds a checkbox allowing user to show or filter out unlabelled sessions from Sessions page. The user's selection is kept in local storage so it will be retained on next load (just as a global flag, not per app) and loaded to a userPreferences prop in the state. We default to showing unlabelled sessions.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
...tatic/src/app/components/sessions/SessionsPage.vue	100.00% <100.00%> (ø)
app/static/src/app/localStorageManager.ts	100.00% <100.00%> (ø)
app/static/src/app/store/appState/actions.ts	100.00% <100.00%> (ø)
app/static/src/app/store/appState/mutations.ts	100.00% <100.00%> (ø)
app/static/src/app/store/appState/state.ts	100.00% <ø> (ø)

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[M-Kusumgar]

Looks good to me! Tested it out, works well!

[richfitz]

This is great. I do wonder if "Hide unlabelled sessions" (with a corresponding change in polarity of the box) might be easier to understand but the users can tell us that