@aws-cdk/aws-iam:standardizedServicePrincipals: produces invalid templates when using some L2 constructs

[lowpast]

Describe the bug

When enabling the feature flag @aws-cdk/aws-iam:standardizedServicePrincipals and using the L2 construct for AppSync "AppsyncFunction", the synthesized template is invalid.

Expected Behavior

The produced assume role policy is valid
"AssumeRolePolicyDocument": {
"Statement": [
{
"Action": "sts:AssumeRole",
"Effect": "Allow",
"Principal": {
"Service": "appsync.amazonaws.com"
}
}

Current Behavior

An invalid assume role policy is produced
"Statement": [
{
"Action": "sts:AssumeRole",
"Effect": "Allow",
"Principal": {
"Service": "appsync"
}
}

As "Service": "appsync" is not a valid principal.

Reproduction Steps

Enable the feature flag @aws-cdk/aws-iam:standardizedServicePrincipals
Create a new AppsyncFunction
npx cdk synth
npx cdk deploy <stack_name>

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.51.1

Framework Version

No response

Node.js Version

16.18

OS

OSx, AmazonLinux2

Language

Typescript

Language Version

No response

Other information

No response

[peterwoodworth]

We've addressed this issue, see here #23035

[github-actions]

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