Add validation when importing an incomplete YAML file prompts to create resources

[Finenyaco]

Describe the bug

Importing an incomplete YAML file prompts successful creation

Steps to reproduce

1. Import a yaml file to create a resource as shown below:

attributes:
    containers:
    - image: nginx
      envs:
      - name: test
        value: ${res.res-c.address}

Result

2024-03-15.11.55.49.mov

Expected behavior

Environment

• Walrus version: v0.6.0-rc2

Additional context
Add any other context about the problem here.