fix(cli): default command line args override cdk.json when not specified

Previously, pathMetadata, assetMetadata, debug and staging could not be set in `cdk.json`
as command-line parameters defaults would always overwrite this. In particular, this
`cdk.json` would be ignored:

```
{
  "app": "npx ts-node --prefer-ts-exts bin/example",
  ...
  "pathMetadata": false,
  "assetMetadata": false
}
```

The issue is this piece of code:
```
 this.settings = this.defaultConfig
            .merge(userConfig)
            .merge(this.projectConfig)
            .merge(this.commandLineArguments)
            .makeReadOnly();
```

`commandLineArguments` returns true for the above mentioned options. This commit is a copy
of #21891 which fell through the cracks, so I'm picking
up as this can potentially cause outages to resources that have drift under the hood, and
adding metadata looks like an `Update` operation to CloudFormation.

There are already unit tests around the cli which show that the same behavior works, located
here:
https://github.com/aws/aws-cdk/blob/main/packages/%40aws-cdk-testing/cli-integ/tests/cli-integ-tests/cli.integtest.ts

fixes #3573
shoutout to @berenddeboer who did the work, I'm just reviving it.

packages/aws-cdk/lib/cli.ts

@@ -77,8 +77,8 @@ async function parseCommandLineArguments(args: string[]) {
     .option('ca-bundle-path', { type: 'string', desc: 'Path to CA certificate to use when validating HTTPS requests. Will read from AWS_CA_BUNDLE environment variable if not specified', requiresArg: true })
     .option('ec2creds', { type: 'boolean', alias: 'i', default: undefined, desc: 'Force trying to fetch EC2 instance credentials. Default: guess EC2 instance status' })
     .option('version-reporting', { type: 'boolean', desc: 'Include the "AWS::CDK::Metadata" resource in synthesized templates (enabled by default)', default: undefined })
-    .option('path-metadata', { type: 'boolean', desc: 'Include "aws:cdk:path" CloudFormation metadata for each resource (enabled by default)', default: true })
-    .option('asset-metadata', { type: 'boolean', desc: 'Include "aws:asset:*" CloudFormation metadata for resources that uses assets (enabled by default)', default: true })
+    .option('path-metadata', { type: 'boolean', desc: 'Include "aws:cdk:path" CloudFormation metadata for each resource (enabled by default)', default: undefined })
+    .option('asset-metadata', { type: 'boolean', desc: 'Include "aws:asset:*" CloudFormation metadata for resources that uses assets (enabled by default)', default: undefined })
     .option('role-arn', { type: 'string', alias: 'r', desc: 'ARN of Role to use when invoking CloudFormation', default: undefined, requiresArg: true })
     .option('staging', { type: 'boolean', desc: 'Copy assets to the output directory (use --no-staging to disable the copy of assets which allows local debugging via the SAM CLI to reference the original source files)', default: true })
     .option('output', { type: 'string', alias: 'o', desc: 'Emits the synthesized cloud assembly into a directory (default: cdk.out)', requiresArg: true })

packages/aws-cdk/lib/settings.ts

@@ -74,6 +74,7 @@ export class Configuration {
 
   public readonly defaultConfig = new Settings({
     versionReporting: true,
+    assetMetadata: true,
     pathMetadata: true,
     output: 'cdk.out',
   });