fix(cfn-include): short form for Condition (#9865)

Add YAML support for the short form of Condition: `!Condition`.

fixes #9785

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: njlynch

packages/@aws-cdk/cloudformation-include/lib/file-utils.ts

@@ -35,6 +35,7 @@ const shortForms: yaml_types.Schema.CustomTag[] = [
   'Select', 'Split', 'Transform', 'And', 'Equals', 'If', 'Not', 'Or',
 ].map(name => makeTagForCfnIntrinsic(name)).concat(
   makeTagForCfnIntrinsic('Ref', false),
+  makeTagForCfnIntrinsic('Condition', false),
   makeTagForCfnIntrinsic('GetAtt', true, (_doc: yaml.Document, cstNode: yaml_cst.CST.Node): any => {
     // The position of the leftmost period and opening bracket tell us what syntax is being used
     // If no brackets are found, then the dot notation is being used; the leftmost dot separates the

packages/@aws-cdk/cloudformation-include/test/test-templates/yaml/short-form-conditions.yaml

@@ -0,0 +1,18 @@
+Conditions:
+  AlwaysTrueCond:
+    !Not [ !Equals [ !Ref "AWS::Region", completely-made-up-region1 ] ]
+  AnotherAlwaysTrueCond:
+    !Not [ !Equals [ !Ref "AWS::Region", completely-made-up-region2 ] ]
+  ThirdAlwaysTrueCond:
+    !Not [ !Equals [ !Ref "AWS::Region", completely-made-up-region3 ] ]
+  CombinedCond:
+    !Or [!Condition AlwaysTrueCond, !Condition AnotherAlwaysTrueCond, !Condition ThirdAlwaysTrueCond]
+Resources:
+  Bucket:
+    Type: AWS::S3::Bucket
+    Properties:
+      BucketName:
+        !If
+        - CombinedCond
+        - MyBucketName
+        - !Ref AWS::NoValue

packages/@aws-cdk/cloudformation-include/test/yaml-templates.test.ts

@@ -316,6 +316,51 @@ describe('CDK Include', () => {
     });
   });
 
+  test('can ingest a template with the short form Conditions', () => {
+    includeTestTemplate(stack, 'short-form-conditions.yaml');
+
+    expect(stack).toMatchTemplate({
+      "Conditions": {
+        "AlwaysTrueCond": {
+          "Fn::Not": [
+            { "Fn::Equals": [{ "Ref": "AWS::Region" }, "completely-made-up-region1"] },
+          ],
+        },
+        "AnotherAlwaysTrueCond": {
+          "Fn::Not": [
+            { "Fn::Equals": [{ "Ref": "AWS::Region" }, "completely-made-up-region2"] },
+          ],
+        },
+        "ThirdAlwaysTrueCond": {
+          "Fn::Not": [
+            { "Fn::Equals": [{ "Ref": "AWS::Region" }, "completely-made-up-region3"] },
+          ],
+        },
+        "CombinedCond": {
+          "Fn::Or": [
+            { "Condition": "AlwaysTrueCond" },
+            { "Condition": "AnotherAlwaysTrueCond" },
+            { "Condition": "ThirdAlwaysTrueCond" },
+          ],
+        },
+      },
+      "Resources": {
+        "Bucket": {
+          "Type": "AWS::S3::Bucket",
+          "Properties": {
+            "BucketName": {
+              "Fn::If": [
+                "CombinedCond",
+                "MyBucketName",
+                { "Ref": "AWS::NoValue" },
+              ],
+            },
+          },
+        },
+      },
+    });
+  });
+
   test('can ingest a yaml with long-form functions and output it unchanged', () => {
     includeTestTemplate(stack, 'long-form-subnet.yaml');