save new warehouse credentials to dbt core blocks

[codecov-commenter]

Codecov Report

Patch coverage: 10.52% and project coverage change: -5.44 :warning:

Comparison is base (c4738cf) 81.93% compared to head (6ff4073) 76.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #49 +/- ## ========================================== - Coverage 81.93% 76.50% -5.44% ========================================== Files 2 2 Lines 692 749 +57 ========================================== + Hits 567 573 +6 - Misses 125 176 +51 ``` | [Impacted Files](https://app.codecov.io/gh/DevDataPlatform/prefect-proxy/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DevDataPlatform) | Coverage Δ | | |---|---|---| | [proxy/service.py](https://app.codecov.io/gh/DevDataPlatform/prefect-proxy/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DevDataPlatform#diff-cHJveHkvc2VydmljZS5weQ==) | `68.85% <5.55%> (-6.91%)` | :arrow_down: | | [proxy/main.py](https://app.codecov.io/gh/DevDataPlatform/prefect-proxy/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DevDataPlatform#diff-cHJveHkvbWFpbi5weQ==) | `83.81% <19.04%> (-3.76%)` | :arrow_down: |

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