VSCode extension should use the fabric client timeout preference when getting a list of installed chaincodes

[davidkel]

If you have too many chaincodes installed on a peer, the extension can timeout trying to get that list. Unfortunately there is no easy way to configure this timeout (most likely defaults to the default value set by the node-sdk). As the extension defines a fabric client timeout value for other fabric interactions (via a fabric client), the request to get a list of installed chaincodes should make use of this timeout as well.

[jt-nti]

See #3183