Follow-up to #9759.
Because the MatrixClientPeg pushes the use_rust_crypto setting back into the SettingsStore, the setting was leaking out to other tests despite getValue's mock being restored.
The solution is to mock out setValue as well.
This PR adds an option to `config.json` which will make the js-sdk use the rust crypto sdk, instead of the libolm implementation.
To use it, you need to add something like this to `config.json`:
```
"features": {
"feature_rust_crypto": true
},
```
We don't (yet) have any way to migrate a device between implementations, so the setting that was in use when you log in is persisted to the device; it is *visible* via the labs section but cannot currently be changed.
This is part of https://github.com/vector-im/element-web/issues/21972, and enables the functionality added to the js-sdk in https://github.com/matrix-org/matrix-js-sdk/pull/2969.
* Fix MatrixClientPeg.userRegisteredWithinLastHours so that it works
* Try fixing end-to-end test + add case for New search beta
* Remove end-to-end test case for Search beta toast as it only shows up after 5 minutes
* Revert to localStorage based solution + non-inverted logic + test including time advancement
Richard van der Hoff