chore: revert to continuous projen releases (#20)

The manual release process doesn't quite work as nicely as I'd hope. We'll just keep it as-is for now. We can revisit this if the releases seem too spammy (e.g., using multiple branches).

Author: Eugene Cheung

.gitattributes

@@ -1,4 +1,4 @@
-const { awscdk, DependencyType, release } = require("projen");
+const { awscdk, DependencyType } = require("projen");
 
 const CDK_VERSION = "1.123.0";
 const CONSTRUCTS_VERSION = "3.3.69";
@@ -9,7 +9,6 @@ const project = new awscdk.AwsCdkConstructLibrary({
   author: "CDK Monitoring Constructs Team",
   authorAddress: "[email protected]",
   defaultReleaseBranch: "main",
-  releaseTrigger: release.ReleaseTrigger.manual(),
 
   cdkVersion: CDK_VERSION,
   cdkVersionPinning: true,