Use Related metadata for autocomplete API discovery

[dheeraj12347]

Summary

Fixes apache/cloudstack#10442
CloudMonkey already parses and stores the related metadata exposed by CloudStack APIs in APIArg.Related, but findAutocompleteAPI() did not use this information during autocomplete API discovery.

This change updates autocomplete API selection to prefer Related metadata before falling back to the existing heuristic-based lookup.

Changes

• Use APIArg.Related when selecting the autocomplete lookup API.
• Prefer Related APIs whose noun matches the expected resource noun.
• Fall back to any valid Related list API if no noun match is found.
• Preserve all existing heuristic-based lookup logic as a fallback.

Validation

Verified runtime behavior for common entity-reference parameters:

• zoneid → listZones
• domainid → listDomains
• networkid → listNetworks

Build and validation:

go fmt ./...
go test ./...
go build -o bin/cmk .