What this PR does:

• Implements the DetermineVersions lifecycle method for the new Cloud Run v1 plugin.
• Adds a robust ImageVersionExtraction helper function to handle diverse container image formats environments.
• Updates the CloudRunDeploymentInput struct in application.go to include the image field required for version determination.
• Includes comprehensive unit tests in plugin_test.go to verify the extraction logic against various real-world image strings.

Why we need it:
The v1 plugin architecture requires explicit logic to identify artifact versions for the Control Plane. This implementation allows PipeCD to correctly populate the "Version" column in the Deployment UI, which is a core requirement for the Cloud Run v1 migration.

Which issue(s) this PR fixes:
Fixes #6114

Does this PR introduce a user-facing change?:
Yes.

• How are users affected by this change: Users must now specify the image field within the input section of their Cloud Run application configuration. This enables PipeCD to track and display the specific container version being deployed.
• Is this breaking change: No, as this is part of the initial migration to the v1 plugin architecture.
• How to migrate (if breaking change): N/A.