Hard coded references to fabric__create_table_as

[ms32035]

For example here:
https://github.com/microsoft/dbt-fabric/blob/main/dbt/include/fabric/macros/materializations/models/incremental/incremental.sql#L34
we should be doing adapter.create_table_as. The current code breaks things downstream in dbt-sqlserver

[prdpsvs]

@ms32035 , this being handled in dbt-fabric 1.8.6 PR #178
I am fixing such downstream issues that might happen in dbt-synapse. Do add more if you find any.
I will release the minor patch tomorrow.

[prdpsvs]

@ms32035 , hard coded references are removed except for tests helper. Synapse adapter will have its own version of tests helper.
Please review v1.8.6 release and let me know. I am closing this issue at this time but feel free to share any other hard coded references.