Group exception-building methods together

[misolt]

• Create a class for exceptions specific to Snowflake assessment.
• Also fix a regression in Snowflake Lite validation and add a test to prevent it.

[github-actions]

Code Coverage Report

Overall Project	61.64% -0.06%	🍏
Files changed	86.75%	🍏

File	Coverage
SnowflakeLogsConnector.java	86.09%	🍏
SnowflakeUsageException.java	84.85% -15.15%	🍏
SnowflakeMetadataConnector.java	84.64%	🍏
AbstractSnowflakeConnector.java	72.82%	🍏
SnowflakeAccountUsageMetadataConnector.java	65%	🍏
SnowflakeInformationSchemaMetadataConnector.java	65%	🍏
SnowflakeLiteConnector.java	51.02%	🍏