Fix the check in IsDeploymentAvailable function.

[marcellmartini]

Description

According to the documentation of Deployment complete status, the statuses that must be checked to validate that a deployment has been completed are:

• Type: Progressing
• Status: True
• Reason: NewReplicaSetAvailable

Fixes #1277.

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

• Fixed IsDeploymentAvailable function.
• Updated test related to IsDeploymentAvailable function.