refactor: only get credentials when required

[roleyfoley]

Description

In the bash executor cli only get the credentials for cloud providers when they are required

With the use of more query tooling in the hamlet cli we generate templates which are used by a hamlet user to find out about thier deployment

Motivation and Context

Fixes #173

How Has This Been Tested?

Tested locally

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] Refactor (non-breaking change which improves the structure or operation of the implementation)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Followup Actions

• [x] None

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [X] None of the above.