As a follow up to T375900: Allow users to override experiment enrollment, we should provide error messaging when override parameters are invalid.

Description

Currently the Metrics Platform silently fails when override parameters for experiments are incorrectly written. Since the end users of these overrides are QTEs, we should provide both a log entry when invalid override parameters are processed and a message in the console for immediate feedback

Acceptance Criteria

• When experiment overrides are invalid, submit a log entry with the error message
• When experiment overrides are invalid, send a message in the console with the error message