check-script-ref-and-source erroneously checks refs in comments

[vholmer]

Describe the bug
When running check-script-ref-and-source on a model containing a comment which itself contains a ref the pre-commit will check if this referenced model exists. If it's in a comment it should disregard that model.

To Reproduce

-- In the future this will be {{ ref('future_model') }}
select * from {{ ref('current_model') }}

Fails with:

- hook id: check-script-ref-and-source
- exit code: 1

Missing model (ref) future_model

Expected behavior
Any ref in comment should be disregarded by check-script-ref-and-source.

Version:
v1.2.0