feat: upload cosign public key and notation certificates to cloud (#1744)

- using secrets manager for storing public keys and certificates
- adding a default truststore for notation verification and upload all certificates to this default truststore
- removig `truststoreName` query param from notation api for uploading certificates


(cherry picked from commit eafcc1a213)

Signed-off-by: Andreea-Lupu <andreealupu1470@yahoo.com>

pkg/api/controller.go

@@ -265,6 +265,11 @@ func (c *Controller) InitMetaDB(reloadCtx context.Context) error {
 			return err
 		}
 
+		err = ext.SetupExtensions(c.Config, driver, c.Log) //nolint:contextcheck
+		if err != nil {
+			return err
+		}
+
 		err = driver.PatchDB()
 		if err != nil {
 			return err