Check for .well-known E2EE settings under new key
Check for .well-known E2EE settings under new key

This adds an extra check for `.well-known` E2EE settings under the key
`im.vector.e2ee`. The older key `im.vector.riot.e2ee` is kept for historical
compatibility.

Part of https://github.com/vector-im/element-web/issues/14954

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk