Support MinIO Credentials block as credentials for `push_to_s3` and `pull_from_s3`

[kevingrismore]

When using prefect.yaml, allows the user to supply a MinIO Credentials block name for the push_to_s3 and pull_from_s3 deployment steps.

Example

build: null

push:
  - prefect_aws.deployments.steps.push_to_s3:
      bucket: test
      folder: my-project
      credentials: "{{ prefect.blocks.minio-credentials.test-creds }}"

pull:
  - prefect_aws.deployments.steps.pull_from_s3:
      bucket: test
      folder: my-project
      credentials: "{{ prefect.blocks.minio-credentials.test-creds }}"

deployments:
  - name: minio-stored-deployment
    entrypoint: flow.py:my_minio_flow
    work_pool:
      name: my-ecs-pool
    is_schedule_active: true

Screenshots

Docstring update for push_to_s3 and pull_from_s3:

Checklist

• [ ] References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• [x] Includes tests or only affects documentation.
• [x] Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• [x] Includes screenshots of documentation updates.
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• [x] Summarizes PR's changes in CHANGELOG.md