feat(metadata): Ignore service if the dependencies are not found (#2171)

* feat(metadata): Ignore service if the dependencies are not found

* chore: Use errors.Is instead of equal operator

api/metadata/server.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"sync"
@@ -76,6 +77,10 @@ func (s *Server) load() error {
 			}
 			fdps, e := allDependency(fdp)
 			if e != nil {
+				if errors.Is(e, protoregistry.NotFound) {
+					// Skip this service if one of its dependencies is not found.
+					continue
+				}
 				err = e
 				return false
 			}