🩹 Remove table_owner from text only cols

[morgan-dgk]

Problem

PR #1057 added several new column names to the text_only_columns arg to the table_from_rows call in the _catalog_filter_table class method. This method is called as part of the dbt docs generate task.

However, some of the new column names included are not included in the list of columns returned by certain adapter implementations for the __get_catalog and __get_catalog_relations.
For example, the relevant BigQuery and Athena macros do not return a column named table_owner (see #1135).

This results in the agate type checker emitting a warning when attempting typing checking runs.

Solution

Any columns added to the text_only_columns argument for the call to table_from_rows in the base implementation should presumably be columns that are returned by all adapters implementations.

This PR removes the table_owner name from the list of text_only_columns included in the base implementation of _catalog_filter_table and moves this to a Snowflake-specific adapter implementation.

I investigated whether agate provides a means of suppressing this warning but there does not appear to be a mechanism to do so. Additionally, I am unsure whether this would be desirable.

resolves #1135

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change in the dbt-adapters package. For details on how to document a change, see the Contributing Guide.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change in the dbt-snowflake package. For details on how to document a change, see the Contributing Guide.

[colin-rogers-dbt]

nit: move imports above comment

Suggested change

	# On snowflake, users can set QUOTED_IDENTIFIERS_IGNORE_CASE, so force
	# the column names to their lowercased forms.
	from dbt_common.clients.agate_helper import table_from_rows
	from dbt.adapters.base.impl import _catalog_filter_schemas
	from dbt_common.clients.agate_helper import table_from_rows
	from dbt.adapters.base.impl import _catalog_filter_schemas
	# On snowflake, users can set QUOTED_IDENTIFIERS_IGNORE_CASE, so force
	# the column names to their lowercased forms.

[colin-rogers-dbt]

one other option here would be to add a method that adapters implement to override this instead of needing to override the whole method

i.e.

def _get_text_only_cols() -> List[str]
    return [...]

Then we snowflake / whomever can implement this method to override the default