[BUG] Not yet implemented: PostgreSQL's list_relations_schemas

**Describe the bug**
A clear and concise description of what the bug is.

While testing or building a model, I get this message:

_panic: panicked at fs/sa/crates/dbt-adapter/src/metadata/postgres/mod.rs:155:35:
not yet implemented: PostgreSQL's list_relations_schemas_

Works with DBT Core

**What version of dbt Fusion is this bug in? (find out by running `dbt --version`)**

dbt-fusion 2.0.0-preview.154

**Is this a discrepancy between the dbt Fusion Engine and dbt Core? Check one.**
- [X] YES
- [ ] NO

**To Reproduce**
Please submit one of the following
* A minimal YML snippet which reproduces the behavior
* A minimal dbt project which reproduces the behavior
* A description so detailed that the issue can be easily reproduced

We're using a POSTGRES warehouse. We were trying to test/build the models.

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Operating System and CPU Type (please complete the following information):**
* Mac/Windows/Linux?
* X86 or ARM?

x86 linux - WSL2