feat(conversion): enable best-effort output and silence usage on errors

[Cna59]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR improves the error handling behavior of the ingress2gateway print command to support best-effort conversion:

1. Removes usage display on errors: When conversion errors occur, the usage information is no longer displayed, providing cleaner error output.
2. Enables best-effort conversion: The tool now continues processing and outputs valid converted resources even when some resources contain errors, respecting the --output format flag.

Previously, when encountering errors (e.g., unsupported ImplementationSpecific pathType), the command would:

• Display the full usage help, cluttering the error output
• Not output any successfully converted resources in the requested format

After this change, the command:

• Shows only the error messages without usage information
• Continues conversion and outputs all valid resources in the requested format (YAML/JSON)
• Displays errors at the end for visibility

Which issue(s) this PR fixes:

Fixes #

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

The `ingress2gateway print` command now supports best-effort conversion, continuing to output valid resources even when errors are encountered. Error output no longer includes usage information for cleaner display.

---

Testing

To test this PR, use the following command with a file containing both valid and invalid resources:

./ingress2gateway print --input-file best-effort-input.yaml --providers ingress-nginx --output yaml

Test Input (best-effort-input.yaml)

apiVersion: v1
kind: Service
metadata:
  name: valid-service
  namespace: test
spec:
  ports:
  - port: 80
    targetPort: 8080
    name: http
---
apiVersion: v1
kind: Service
metadata:
  name: invalid-service
  namespace: test
spec:
  ports:
  - port: 80
    targetPort: invalid-port
    name: http
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: valid-ingress
  namespace: test
spec:
  ingressClassName: test-class
  rules:
  - host: valid.example.com
    http:
      paths:
      - path: /valid
        pathType: Prefix
        backend:
          service:
            name: valid-service
            port:
              number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: invalid-backend-ingress
  namespace: test
spec:
  ingressClassName: test-class
  rules:
  - host: invalid.example.com
    http:
      paths:
      - path: /invalid
        pathType: Prefix
        backend:
          service:
            name: invalid-service
            port:
              name: non-existent-port

Expected Output

The command should output valid converted Gateway and HTTPRoute resources in YAML format, followed by error messages:

apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  annotations:
    gateway.networking.k8s.io/generator: ingress2gateway-v0.5.0-rc1-2-g1877e50-dirty
  name: nginx
  namespace: default
spec:
  gatewayClassName: nginx
  listeners:
  - hostname: nginx.example.com
    name: nginx-example-com-http
    port: 80
    protocol: HTTP
status: {}
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  annotations:
    gateway.networking.k8s.io/generator: ingress2gateway-v0.5.0-rc1-2-g1877e50-dirty
  name: test-nginx-nginx-example-com
  namespace: default
spec:
  hostnames:
  - nginx.example.com
  parentRefs:
  - name: nginx
status:
  parents: []
Error:

# Encountered 1 errors # spec.rules[0].http.paths[0].pathType: Invalid value: "ImplementationSpecific": implementationSpecific path type is not supported in generic translation, and your provider does not provide custom support to translate it

[k8s-ci-robot]

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This pull-request has been approved by: Cna59
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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Cna59 / name: Maxime Steux (7d35cb9)

[k8s-ci-robot]

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[Cna59]

This enables best-effort conversion and allows users to see what could be converted

[Cna59]

This enables best-effort conversion and allows users to see what could be converted

Etc..

[Cna59]

If you do not want the "best-effort" output i can recreate a pull request with only the "silence usage on errors"

[z15alall]

Tested and it's work's usefull to be able to have an output even if there is "error" !