chore: update node js runtime version in ISO partitions (#35157)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

All ISO partitions now support Node22, so this PR updates the Node
runtime version in all of them. Also, now the `NODEJS_LATEST` variable
in lambda runtime definition uses Node22, as all supported partitions
have reached parity, being Node22 the latest available version in all of
them

### Description of changes

Updated node runtime mappings in fact-table, updated `NODEJS_LATEST` to
map to Node22 and updated all related unit and integration tests

### Describe any new or updated permissions being added

NA


### Description of how you validated changes

Local deployment of all the updated integration tests

### Checklist
- [x] My code adheres to the [CONTRIBUTING
GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and
[DESIGN
GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: alvazjor

packages/@aws-cdk-testing/framework-integ/test/aws-apigateway/test/integ.cors-allow-multiple-origins.js.snapshot/cdk.out

@@ -309,7 +309,7 @@
       "Arn"
      ]
     },
-    "Runtime": "nodejs18.x"
+    "Runtime": "nodejs22.x"
    },
    "DependsOn": [
     "handlerServiceRole187D5A5A"

packages/@aws-cdk-testing/framework-integ/test/aws-apigateway/test/integ.cors-allow-multiple-origins.js.snapshot/integ.json

@@ -124,15 +124,7 @@
       "Arn"
      ]
     },
-    "Runtime": {
-     "Fn::FindInMap": [
-      "LatestNodeRuntimeMap",
-      {
-       "Ref": "AWS::Region"
-      },
-      "value"
-     ]
-    },
+    "Runtime": "nodejs22.x",
     "Description": {
      "Fn::Join": [
       "",
@@ -301,142 +293,6 @@
    }
   }
  },
- "Mappings": {
-  "LatestNodeRuntimeMap": {
-   "af-south-1": {
-    "value": "nodejs22.x"
-   },
-   "ap-east-1": {
-    "value": "nodejs22.x"
-   },
-   "ap-east-2": {
-    "value": "nodejs22.x"
-   },
-   "ap-northeast-1": {
-    "value": "nodejs22.x"
-   },
-   "ap-northeast-2": {
-    "value": "nodejs22.x"
-   },
-   "ap-northeast-3": {
-    "value": "nodejs22.x"
-   },
-   "ap-south-1": {
-    "value": "nodejs22.x"
-   },
-   "ap-south-2": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-1": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-2": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-3": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-4": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-5": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-6": {
-    "value": "nodejs22.x"
-   },
-   "ap-southeast-7": {
-    "value": "nodejs22.x"
-   },
-   "ca-central-1": {
-    "value": "nodejs22.x"
-   },
-   "ca-west-1": {
-    "value": "nodejs22.x"
-   },
-   "cn-north-1": {
-    "value": "nodejs22.x"
-   },
-   "cn-northwest-1": {
-    "value": "nodejs22.x"
-   },
-   "eu-central-1": {
-    "value": "nodejs22.x"
-   },
-   "eu-central-2": {
-    "value": "nodejs22.x"
-   },
-   "eu-isoe-west-1": {
-    "value": "nodejs18.x"
-   },
-   "eu-north-1": {
-    "value": "nodejs22.x"
-   },
-   "eu-south-1": {
-    "value": "nodejs22.x"
-   },
-   "eu-south-2": {
-    "value": "nodejs22.x"
-   },
-   "eu-west-1": {
-    "value": "nodejs22.x"
-   },
-   "eu-west-2": {
-    "value": "nodejs22.x"
-   },
-   "eu-west-3": {
-    "value": "nodejs22.x"
-   },
-   "eusc-de-east-1": {
-    "value": "nodejs22.x"
-   },
-   "il-central-1": {
-    "value": "nodejs22.x"
-   },
-   "me-central-1": {
-    "value": "nodejs22.x"
-   },
-   "me-south-1": {
-    "value": "nodejs22.x"
-   },
-   "mx-central-1": {
-    "value": "nodejs22.x"
-   },
-   "sa-east-1": {
-    "value": "nodejs22.x"
-   },
-   "us-east-1": {
-    "value": "nodejs22.x"
-   },
-   "us-east-2": {
-    "value": "nodejs22.x"
-   },
-   "us-gov-east-1": {
-    "value": "nodejs22.x"
-   },
-   "us-gov-west-1": {
-    "value": "nodejs22.x"
-   },
-   "us-iso-east-1": {
-    "value": "nodejs18.x"
-   },
-   "us-iso-west-1": {
-    "value": "nodejs18.x"
-   },
-   "us-isob-east-1": {
-    "value": "nodejs18.x"
-   },
-   "us-isob-west-1": {
-    "value": "nodejs18.x"
-   },
-   "us-west-1": {
-    "value": "nodejs22.x"
-   },
-   "us-west-2": {
-    "value": "nodejs22.x"
-   }
-  }
- },
  "Outputs": {
   "MyApiEndpoint869ABE96": {
    "Value": {