Remove connection factory and fingerprint provider

[redcatbear]

Situation

The pytest-exasol-extension is a better approach to provide a pyexasol connection for the test database builder than the current connection factory and the fingerprint provider.

Once pytest-exasol-extension is compatible with pyexasol 2, we remove connection factory and fingerprint provider.

Acceptance Criteria

1. Integration tests in TDBP use pytest-exasol-extension to get a pyexasol connection
2. Fingerprint provider removed
3. Connection factory removed
4. Documentation explains the use of pytest-exasol-extension in user guide