Penultimate round of db.DefaultContext refactor (#27414)

Part of #27065

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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/auth/httpsign.go

@@ -92,7 +92,7 @@ func VerifyPubKey(r *http.Request) (*asymkey_model.PublicKey, error) {
 
 	keyID := verifier.KeyId()
 
-	publicKeys, err := asymkey_model.SearchPublicKey(0, keyID)
+	publicKeys, err := asymkey_model.SearchPublicKey(r.Context(), 0, keyID)
 	if err != nil {
 		return nil, err
 	}