CDRIVER-3723 finalize URI during client/pool construction (#921)

Introduces new mongoc_client_new_from_uri_with_error and mongoc_client_pool_new_with_error methods. Also addresses topology leak in mongoc_client_new_from_uri (CDRIVER-4251).

* Remove redundant warnings about unused results

* Explain why we need not handle null result from _mongoc_client_new_from_topology

* Log URI errors in mongoc_client_new as warnings

* Clear logs between /Client/max_staleness assertions

* Set error instead of logging in mongoc_client_pool_new_with_error

* Remove test expecting a client with an invalid topology

* Revise assertions in /loadbalanced/client_uri_validation test

This no longer requires constructing a client and expecting an error through server selection.

* Use tracing macro for return statement

* Check MONGOC_ENABLE_SSL in mongoc_client_new_from_uri_with_error

Moving the check up from _mongoc_client_new_from_topology makes mongoc_client_new_from_uri_with_error consistent with mongoc_client_pool_new_with_error. Additionally, we add log message assertions to corresponding tests.

* Anticipate null pool or client in SRV error tests

* Remove obsolete tests for invalid LB topologies

These tests were previously introduced in CDRIVER-4184 but no longer apply now that we prohibit construction of clients and pools with an invalid topology.

* _mongoc_client_new_from_topology should require a valid topology

* Document precondition for _mongoc_client_new_from_topology

Co-authored-by: Ezra Chung <88335979+eramongodb@users.noreply.github.com>
Co-authored-by: Kevin Albertson <kevin.albertson@mongodb.com>