[Bug] Semantic Layer where filter strings are parsed into lists

[courtneyholcomb]

Is this a new bug in dbt-core?

• I believe this is a new bug in dbt-core
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

Currently, if you pass a string into a filter YAML param, it will be assumed to be a list. This means your semantic manifest ends up with a list of strings for where filters. For example, this YAML:

filter: |
    {{ Dimension('customer__customer_type') }}  = 'new'

would look like this in the semantic manifest:

{"where_filters": [{"where_sql_template": "{"}, {"where_sql_template": "{"}, {"where_sql_template": " "}, {"where_sql_template": "D"}, {"where_sql_template": "i"}, {"where_sql_template": "m"}, {"where_sql_template": "e"}, {"where_sql_template": "n"}, {"where_sql_template": "s"}, {"where_sql_template": "i"}, {"where_sql_template": "o"}, {"where_sql_template": "n"}, {"where_sql_template": "("}, {"where_sql_template": "'"}, {"where_sql_template": "c"}, {"where_sql_template": "u"}, {"where_sql_template": "s"}, {"where_sql_template": "t"}, {"where_sql_template": "o"}, {"where_sql_template": "m"}, {"where_sql_template": "e"}, {"where_sql_template": "r"}, {"where_sql_template": "_"}, {"where_sql_template": "_"}, {"where_sql_template": "c"}, {"where_sql_template": "u"}, {"where_sql_template": "s"}, {"where_sql_template": "t"}, {"where_sql_template": "o"}, {"where_sql_template": "m"}, {"where_sql_template": "e"}, {"where_sql_template": "r"}, {"where_sql_template": "_"}, {"where_sql_template": "t"}, {"where_sql_template": "y"}, {"where_sql_template": "p"}, {"where_sql_template": "e"}, {"where_sql_template": "'"}, {"where_sql_template": ")"}, {"where_sql_template": " "}, {"where_sql_template": "}"}, {"where_sql_template": "}"}, {"where_sql_template": " "}, {"where_sql_template": " "}, {"where_sql_template": "="}, {"where_sql_template": " "}, {"where_sql_template": "'"}, {"where_sql_template": "n"}, {"where_sql_template": "e"}, {"where_sql_template": "w"}, {"where_sql_template": "'"}]}

Expected Behavior

The semantic manifest should show this:
{"where_filters": [{"where_sql_template": "{{ Dimension('customer__customer_type') }} = 'new'"}]}

Steps To Reproduce

Add a string filter to a metric or saved query and run dbt parse, then look at the generated semantic manifest.

Relevant log output

No response

Environment

- OS:
- Python:
- dbt:

Which database adapter are you using with dbt?

No response

Additional Context

No response