refactor(msteams): fix depreated parts in msteams service

[nikoksr]

This change fixes all places in the msteams service where we we're still using deprecated parts of the provider library. This change uses a pre-release of go-teams-notify to verify full compatibility between Notify and go-teams-notify, as discussed here.

Regenerated the mock since the service interface changed. Fixed the tests accordingly. Everything passes, we should be good to go.

This PR will get merged as soon as v2.12.0-alpha.1 gets fully released.

cc @atc0005