fix: throw when using upsert in ibmi or snowflake #17155
Merged
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Pull Request Checklist
Description of Changes
This PR separates a change required for PR #16988.
The IBMi and Snowflake dialects do not have valid upsert implementations and would have resulted in database errors due to the current method using unsupported syntax.
This PR removes the unused/invalid code and throws an error is the method is used.
In a future PR, both dialects should have the merge query implemented similar to what DB2 and MS SQL have.
List of Breaking Changes
Snowflake does not support upsert queries.