enhance: Implement new FlushAllMessage and refactor flush all (milvus-io#45920)

This PR:
1. Define and implement the new FlushAllMessage.
2. Refactor FlushAll to flush the entire cluster.

issue: milvus-io#45919

---------

Signed-off-by: bigsheeper <yihao.dai@zilliz.com>

Author: bigsheeper

client/go.mod

@@ -6,15 +6,13 @@ require (
 	github.com/blang/semver/v4 v4.0.0
 	github.com/cockroachdb/errors v1.9.1
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
-	github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251124145901-0b96e4c8af45
+	github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251210030907-6087c9c0bad6
 	github.com/milvus-io/milvus/pkg/v2 v2.6.4-0.20251104142533-a2ce70d25256
 	github.com/quasilyte/go-ruleguard/dsl v0.3.23
 	github.com/samber/lo v1.27.0
 	github.com/stretchr/testify v1.11.1
 	github.com/tidwall/gjson v1.17.1
-	go.opentelemetry.io/otel v1.34.0
 	go.uber.org/atomic v1.11.0
-	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
 	google.golang.org/grpc v1.71.0
 	google.golang.org/protobuf v1.36.5
 )
@@ -94,6 +92,7 @@ require (
 	go.etcd.io/etcd/server/v3 v3.5.5 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.59.0 // indirect
+	go.opentelemetry.io/otel v1.34.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.20.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.20.0 // indirect
 	go.opentelemetry.io/otel/metric v1.34.0 // indirect
@@ -104,6 +103,7 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
 	golang.org/x/net v0.47.0 // indirect
 	golang.org/x/sync v0.18.0 // indirect
 	golang.org/x/sys v0.38.0 // indirect

client/go.sum

@@ -330,8 +330,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5
 github.com/mediocregopher/radix/v3 v3.4.2/go.mod h1:8FL3F6UQRXHXIBSPUs5h0RybMF8i4n7wVopoX3x7Bv8=
 github.com/microcosm-cc/bluemonday v1.0.2/go.mod h1:iVP4YcDBq+n/5fb23BhYFvIMq/leAFZyRl6bYmGDlGc=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
-github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251124145901-0b96e4c8af45 h1:TMUhlirMCH2zgJD+qClP5EP0yuFl1VrE4j+0fiRSuJU=
-github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251124145901-0b96e4c8af45/go.mod h1:/6UT4zZl6awVeXLeE7UGDWZvXj3IWkRsh3mqsn0DiAs=
+github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251210030907-6087c9c0bad6 h1:TeHfsRCdjbX30xS7Npcb+POQXd460+AjmXYmmTuxyBA=
+github.com/milvus-io/milvus-proto/go-api/v2 v2.6.6-0.20251210030907-6087c9c0bad6/go.mod h1:/6UT4zZl6awVeXLeE7UGDWZvXj3IWkRsh3mqsn0DiAs=
 github.com/milvus-io/milvus/pkg/v2 v2.6.4-0.20251104142533-a2ce70d25256 h1:M2waty0w2k4YT2HHzJk3fx6EFPD4DKxNJatitIV+gGU=
 github.com/milvus-io/milvus/pkg/v2 v2.6.4-0.20251104142533-a2ce70d25256/go.mod h1:HT6Wxahwj/l8+i+D/C3iwDzCjDa36U9gyVw6CjjK4pE=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=