QDT export: support plugins from unofficial repository

[Guts]

When a profile contains plugins installed from a third-party repository
, Actually the export gives:

{
    "$schema": "https://raw.githubusercontent.com/qgis-deployment/qgis-deployment-toolbelt-cli/main/docs/schemas/profile/qgis_profile.json",
    "plugins": [
        {
            "name": "Azimuth and Distance Calculator",
            "folder_name": "AzimuthDistanceCalculator",
            "official_repository": true,
            "plugin_id": 606,
            "version": "2.0.2"
        },
        {
            "name": "DICT",
            "folder_name": "DICT",
            "official_repository": true,
            "plugin_id": 1545,
            "version": "1.0.2"
        },
        {
            "name": "Plugin Reloader",
            "folder_name": "plugin_reloader",
            "official_repository": true,
            "plugin_id": 143,
            "version": "0.18"
        },
        {
            "name": "Profile Manager",
            "folder_name": "profile_manager",
            "official_repository": true,
            "plugin_id": 3547,
            "version": "0.6.0"
        },
        {
            "name": "QRestart",
            "folder_name": "QRestart",
            "official_repository": true,
            "plugin_id": 2887,
            "version": "0.2"
        }
    ]
}

With this PR:

{
    "$schema": "https://raw.githubusercontent.com/qgis-deployment/qgis-deployment-toolbelt-cli/main/docs/schemas/profile/qgis_profile.json",
    "plugins": [
        {
            "name": "Azimuth and Distance Calculator",
            "folder_name": "AzimuthDistanceCalculator",
            "version": "2.0.2",
            "plugin_id": 606,
            "official_repository": true
        },
        {
            "name": "DICT",
            "folder_name": "DICT",
            "version": "1.0.2",
            "plugin_id": 1545,
            "official_repository": true
        },
        {
            "name": "Plugin Reloader",
            "folder_name": "plugin_reloader",
            "version": "0.18",
            "plugin_id": 143,
            "official_repository": true
        },
        {
            "name": "QRestart",
            "folder_name": "QRestart",
            "version": "0.2",
            "plugin_id": 2887,
            "official_repository": true
        },
        {
            "name": "reperesDeCrues",
            "folder_name": "reperesDeCrues",
            "version": "1.5.0",
            "plugin_id": 3214691075,
            "official_repository": false,
            "download_url": "https://plugins.custom.org/download.php?plugin=reperesDeCrues.1.5.0"
        }
    ]
}

❤️ Funded by Oslandia

[Guts]

@nicogodet if you want to review this one, you could be interested in.

[nicogodet]

Bruh?

if plugin_info:
    profile_plugin_list.append(plugin_info)

is equivalent to current if/elif ?