[Bug]: Incorrect `Create variable with type` code actions are generated for external function bodies with non-error return types

[nipunayf]

Description

$title. We cannot break a union return type into multiple code actions as we do with dependable types. There should be only one code action representing the final return type, i.e string|int|boolean|error.

Steps to Reproduce

Prompt code actions for the following cursor position.

client class MyClient {
    resource function get albums/[string id](typedesc<string> targetType = <>)
        returns targetType|int|boolean|error = external;
}

function name() {
    MyClient myCl = new;
    <CURSOR>myCl->/albums/["path"]();
}

Affected Version(s)

Ballerina 2201.8.6 (Swan Lake Update 8)

OS, DB, other environment details and versions

OS: macOS 14.4.1 23E224 JDK: openjdk 17.0.8 2023-07-18

Related area

-> Compilation

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