Optimise Python Client Logger Strings

[PE39806]

A large number of the logging statements in the python client incorrectly mix f-strings with string formatting e.g. logger.info(f"Schema %s successfully retrieved from server.", schema_id). This does not break functionality but is sub-optimal and not best-practice.

This presumably comes from an attempt to address logging-fstring-interpolation / W1203 which has resulted in a large number of f-string-without-interpolation / W1309 issues.

Making use of the pylint plugin for VSCode will make these problems easy to identify and fix.