enhance: [StorageV2] clean up legacy flag (#43290)

related: #39173

Signed-off-by: shaoting-huang <shaoting.huang@zilliz.com>

configs/milvus.yaml

@@ -960,7 +960,6 @@ common:
       warn: 1000 # minimum milliseconds for printing durations in warn level
     maxWLockConditionalWaitTime: 600 # maximum seconds for waiting wlock conditional
   storage:
-    scheme: s3
     enablev2: false
   # Whether to disable the internal time messaging mechanism for the system.
   # If disabled (set to false), the system will not allow DML operations, including insertion, deletion, queries, and searches.

pkg/util/paramtable/component_param.go

@@ -271,7 +271,6 @@ type commonConfig struct {
 	LockSlowLogWarnThreshold    ParamItem `refreshable:"true"`
 	MaxWLockConditionalWaitTime ParamItem `refreshable:"true"`
 
-	StorageScheme             ParamItem `refreshable:"false"`
 	EnableStorageV2           ParamItem `refreshable:"false"`
 	StoragePathPrefix         ParamItem `refreshable:"false"`
 	StorageZstdConcurrency    ParamItem `refreshable:"false"`
@@ -850,14 +849,6 @@ Large numeric passwords require double quotes to avoid yaml parsing precision is
 	}
 	p.EnableStorageV2.Init(base.mgr)
 
-	p.StorageScheme = ParamItem{
-		Key:          "common.storage.scheme",
-		Version:      "2.3.4",
-		DefaultValue: "s3",
-		Export:       true,
-	}
-	p.StorageScheme.Init(base.mgr)
-
 	p.StoragePathPrefix = ParamItem{
 		Key:          "common.storage.pathPrefix",
 		Version:      "2.3.4",