Throw exception instead of ignoring connection string scheme or parameters

Suggested release note:

`Cluster.connect` now throws an `IllegalArgumentException` if you pass a pre-built `ClusterEnvironment` and a connection string incompatible with the environment.

• A pre-built environment without TLS enabled is incompatible with a connection string that specifies the secure `couchases` scheme.
• A pre-built environment is incompatible with a connection string that has parameters.

Before this change, an incompatibility was logged as a warning, and the connection string scheme and parameters were ignored.

`ConnectionStringIgnoredEvent` is now deprecated, since the SDK never publishes it anymore.