fix find_column_type utility method

[rhaffar]

• Updated find_column_type method to only map columns types to date if they contain data with valid Snowflake date formats
• Added warehouse parameter to find_column_type method to differentiate column type mappings based on warehouse type (only affects dates)
• Updated test and internal calls of find_column_type

*Apologies for the delay, had to wait for appropriate permissions to make public github contributions

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1 out of 2 committers have signed the CLA.

✅ rhaffar
❌ ekn111

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[fdosani]

@rhaffar you will need to sign the CLA. Not sure but you might have a leak with the second user. FYI.

[rhaffar]

@rhaffar you will need to sign the CLA. Not sure but you might have a leak with the second user. FYI.

Ah yeah, I'll address that and open a separate PR.