[Bug]: Listening phase does not start when listeners are available only in imported modules

[Nadeeshan96]

Description

Listening phase does not start when listeners are available only in imported modules.

With 7aff2ff it will work when the code is compiled for the first time (without using BIR cache). But the problem will exist when the code is compiled using the BIR cache because both the packageSymbol.bir and importPkgSymbol will be null.

Steps to Reproduce

Without using any Ballerina libraries, the issue can be reproduced as follows.

1. Clean .Ballerina folder.
2. Extract the Ballerina package.
   test_listener_non_default.zip
3. Run bal clean, bal pack, and bal push --repository local for the above package.
4. Extract the Ballerina package.
   use_listener.zip
5. Run bal run for the above package. It should hang in the listening phase until SIGINT is received.

Issue with http listeners is illustrated below.

1. Run bal clean, bal pack, and bal push --repository local for a Ballerina package with below service.

import ballerina/http;

listener http:Listener httpListener = new (8080);

service / on httpListener {
    resource function get greeting() returns string { 
        return "Hello, World!"; 
    }
}

Ballerina.toml

[package]
org = "nadeeshand"
name = "httpservice"
version = "0.1.0"

[build-options]
observabilityIncluded = true

2. Create another bal package with below code and run it. It does not go to the listening phase when the code is compiled from BIR cache. If the listener is in a non-default module I think it will not work in the first time compilation also.

import nadeeshand/httpservice as _;

Ballerina.toml

[package]
org = "nadeeshand"
name = "usehttpservice"
version = "0.1.0"


[[dependency]]
org = "nadeeshand"
name = "httpservice"
version = "0.1.0"
repository = "local"

[build-options]
observabilityIncluded = true

Affected Version(s)

2201.7.3

OS, DB, other environment details and versions

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Related area

-> Compilation

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