Resolve "Prevent containerlab:destroy pipeline step from running if not needed"

Description

Only run containerlab:destroy when containerlab:deploy ran, regardless of passing or failing the deployment as well as the integration tests.

Related Issue

#132 (closed)

Motivation and Context

How Has This Been Tested?

Testet for:

• Skipping interation tests
• Passing deployment & integration tests
• Passing deployment; failing one or all integration tests
• Failing deployment, therefore skipping integration tests

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.