backport of commit 7dc4255 (#27315)

Co-authored-by: akshya96 <[email protected]>

vault/activity_log_util.go

@@ -7,13 +7,9 @@ package vault
 
 import (
 	"context"
-	"time"
 )
 
 // sendCurrentFragment is a no-op on OSS
 func (a *ActivityLog) sendCurrentFragment(ctx context.Context) error {
 	return nil
 }
-
-// CensusReport is a no-op on OSS
-func (a *ActivityLog) CensusReport(context.Context, CensusReporter, time.Time) {}