Fix Powerlevels and add Room Version 12 changes

[Marcel-Nordeck]

We did quite a bit of stuff wrong. This aims to fix this and add the new room version 12 assumptions too.

The currently failing ui tests are mostly broken tests where redux store isnt applied, the user id isnt valid or we relied on incorrect permission assumptions.

✔️ Checklist

• A changeset describing the change and affected packages (more info).
• Added or updated documentation.
• Tests for new functionality and regression tests for bug fixes.
• Screenshots or videos attached (for UI changes).
• All your commits have a Signed-off-by line in the message (more info).

[changeset-bot]

🦋 Changeset detected

Latest commit: afba230

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@matrix-widget-toolkit/api	Major
@matrix-widget-toolkit/testing	Major
@matrix-widget-toolkit/mui	Patch
@matrix-widget-toolkit/react	Patch

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[Marcel-Nordeck]

Review Guide

The big changes to the tests

A note on the various test changes: 99% are just adding :example.com to the user ids and room ids to match what we validate. This is necessary since for the Powerlevel related changes (powerlevel event validation specifically) we now check for the sender id and room id to be valid. However this means we had to change the default user and room id within the mockwidgetapi surface. Which essentially affects every test :/ There is no workaround other than fixing code debt here.

Which tests actually changed?

The example widget's PowerLevelsPage, The example widget's RelationsPage, powerlevel tests in the api package

Which other files are real changes?

Basically the same as the tests. However also the example widget powerLevelsApi.ts, and the api package events.ts. There are some changes to the redux store which I assumed to need initially but did not end up needing. However I feel like this may come back as useful in the future so I decided to leave them for now.

Use the right ticket

While the branch points to NEO-1593 the actual ticket was later split out as NEO-1602 so please book on NEO-1602 :)

[maheichyk]

Looks good, just few small comments added