Ct 1827/064 column comments tests conversion

[VersusFacit]

resolves #6623
Followup to #6654

Description

Ports persist column tests to the adapter zone.

I'm proceeding to duplicate this test across adapter repos. However, there is no reason to delay reviewing and merging this one. Those tests Ill write elsewhere will point to this code one way or another.

Although not a blocker, here's some bookkeeping on supplementary persist docs conversions in adapter repos:

• dbt-redshift
• dbt-snowflake
• dbt spark (in flight)
• dbt bigquery (blocked on setup issues to be resolved Friday)

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• 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
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[github-actions]

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