chore(region-info): register us-isob-west-1 region (#34249)

### Issue # (if applicable)

Closes part of the checklist from the issue #34066.

> Pending to add [ELBV2_ACCOUNTS](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/region-info/build-tools/fact-tables.ts#L124) for this region. We will add in separate PR once the account is available for this region.

### Reason for this change

register new region

### Description of changes

register new region

### Describe any new or updated permissions being added

N/A

### Description of how you validated changes

yarn build

### 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: godwingrs22

packages/@aws-cdk-testing/framework-integ/test/aws-apigateway/test/integ.restapi.access-log-firehose.js.snapshot/apigatewayaccesslogsfirehoseDefaultTestDeployAssert6376A91B.assets.json

@@ -414,6 +414,9 @@
    "us-isob-east-1": {
     "value": "nodejs18.x"
    },
+   "us-isob-west-1": {
+    "value": "nodejs18.x"
+   },
    "us-west-1": {
     "value": "nodejs20.x"
    },