fix(import): add tracing spans to all import related functions (#8160)

# Which Problems Are Solved

This fix adds tracing spans to all V1 API import related functions. This
is to troubleshoot import related performance issues reported to us.

# How the Problems Are Solved

Add a tracing span to `api/grpc/admin/import.go` and all related
functions that are called in the `command` package.

# Additional Changes

- none

# Additional Context

- Reported by internal communication

internal/command/user_metadata.go

@@ -6,10 +6,14 @@ import (
 	"github.com/zitadel/zitadel/internal/domain"
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/repository/user"
+	"github.com/zitadel/zitadel/internal/telemetry/tracing"
 	"github.com/zitadel/zitadel/internal/zerrors"
 )
 
 func (c *Commands) SetUserMetadata(ctx context.Context, metadata *domain.Metadata, userID, resourceOwner string) (_ *domain.Metadata, err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+
 	err = c.checkUserExists(ctx, userID, resourceOwner)
 	if err != nil {
 		return nil, err