Use execute instead of raw execute to add the query comment as query header

[github-christophe-oudar]

resolves #808

Problem

Intermediate queries involving:

• get_column_schema_from_query
• get_columns_in_select_sql

were using raw_execute which doesn't add sql = self._add_query_comment(sql) resulting in queries that miss the header.

Solution

Replace the calls from raw_execute to execute on both functions

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

[github-actions]

This PR has been marked as Stale because it has been open with no activity as of late. If you would like the PR to remain open, please comment on the PR or else it will be closed in 7 days.

[github-actions]

Although we are closing this PR as stale, it can still be reopened to continue development. Just add a comment to notify the maintainers.