Add from_profiles_yml to dbt TargetConfigs

[kevingrismore]

This is a starting point for converting dbt's profiles.yml contents into Prefect blocks programmatically. Includes a few utilities for getting the profile contents from an expected default or user-supplied directory.

Also fixes cloud tests for httpx==0.28.0 compatibility.

Example usage

profiles.yml

test:
  outputs:
    dev:
      type: duckdb
      path: dev.duckdb
      threads: 1

    prod:
      type: duckdb
      path: prod.duckdb
      threads: 4

  target: prod

test2:
  outputs:
    dev:
      type: duckdb
      path: dev.duckdb2
      threads: 1

    prod:
      type: duckdb
      path: prod.duckdb2
      threads: 4
    
  target: dev

test3:
  outputs:
    dev:
      dataset: demo
      job_execution_timeout_seconds: 300
      job_retries: 1
      keyfile: /path/to/keyfile.json
      location: US
      method: service-account
      priority: interactive
      project: sample_project
      threads: 1
      type: bigquery

    prod:
      dataset: prod
      job_execution_timeout_seconds: 300
      job_retries: 1
      keyfile: /path/to/keyfile.json
      location: US
      method: service-account
      priority: interactive
      project: sample_project
      threads: 1
      type: bigquery

  target: prod

>>> from prefect_dbt.cli.configs import TargetConfigs
>>> TargetConfigs.from_profiles_yml() # first profile, default target
TargetConfigs(extras=None, allow_field_overrides=False, type='duckdb', threads=4)
>>> TargetConfigs.from_profiles_yml("test2") # selected profile, default target
TargetConfigs(extras=None, allow_field_overrides=False, type='duckdb', threads=1)
>>> TargetConfigs.from_profiles_yml("test3", "dev") # selected profile, selected target
TargetConfigs(extras={'job_execution_timeout_seconds': 300, 'job_retries': 1, 'keyfile': '/path/to/keyfile.json', 'location': 'US', 'method': 'service-account', 'priority': 'interactive', 'project': 'sample_project'}, allow_field_overrides=False, type='bigquery', threads=1)
>>> TargetConfigs.from_profiles_yml("test3", "dev").get_configs()
{'job_execution_timeout_seconds': 300, 'job_retries': 1, 'keyfile': '/path/to/keyfile.json', 'location': 'US', 'method': 'service-account', 'priority': 'interactive', 'project': 'sample_project', 'type': 'bigquery', 'schema': 'demo', 'threads': 1}

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[zzstoatzz]

one question about formatting but otherwise lgtm!

[desertaxle]

Nice!