Avoid reserved names in codegen

Prompted by pulumi/pulumi-azure-native#3106: an addition to the Azure spec introduced an enum with the unfortunate name "string" (for which I'll file an upstream issue as well). In the schema, this translated to

        "azure-native:databasewatcher/v20230901preview:String": {
            "description": "The target collection status.",
            "type": "string",
            "enum": [
                {
                    "name": "Enabled",
                    "description": "Denotes a target that is enabled.",
                    "value": "Enabled"
                },
                {
                    "name": "Disabled",
                    "description": "Denotes a target that is disabled.",
                    "value": "Disabled"
                }
            ]
        },

and in the generated Java, to public enum String.

That doesn't compile:

/home/runner/work/pulumi-azure-native/pulumi-azure-native/sdk/java/src/main/java/com/pulumi/azurenative/databasewatcher/enums/String.java:39: error: toString() in com.pulumi.azurenative.databasewatcher.enums.String cannot override toString() in Enum
        public String toString() {
                      ^
  return type com.pulumi.azurenative.databasewatcher.enums.String is not compatible with java.lang.String
/home/runner/work/pulumi-azure-native/pulumi-azure-native/sdk/java/src/main/java/com/pulumi/azurenative/databasewatcher/enums/String.java:38: error: method does not override or implement a method from a supertype
        @Override
        ^
/home/runner/work/pulumi-azure-native/pulumi-azure-native/sdk/java/src/main/java/com/pulumi/azurenative/databasewatcher/enums/String.java:42: error: incompatible types: java.lang.String cannot be converted to com.pulumi.azurenative.databasewatcher.enums.String
                .toString();

It would be great if the Java codegen could automatically detect the use of reserved names and work around it by modifying the name.

Start by tracing the Java codegen that produces sdk/java/src/main/java/com/pulumi/azurenative/databasewatcher/enums/String.java and its enum-name handling. Verify the generated output avoids reserved names and compiles without the shown override errors.