Add config option to disable automatically updating yaml.schemas with systems file:///

[sbriceland]

From ArtilleryScriptManager:

    this.context.subscriptions.push(
      this.analyzer.onDidDetectScript(async (document) => {
        /**
         * @note Provide the full document URI so we apply the schema
         * both to local and to remote files.
         */
        this.scriptPaths.add(document.uri.toString())
        await this.writeConfigPaths()
      }),
      vscode.workspace.onDidDeleteFiles(async (event) => {
        for (const fileUri of event.files) {
          this.scriptPaths.delete(fileUri.toString())
        }

        await this.writeConfigPaths()
      }),
    )

It appears the onDidDetectScript listener automatically writes new config entries into the yaml.schemas list for each new test file detected. While this is convenient, it is problematic for teams that share settings.json.

Ideally there would be an config option like:

{
    "artillery.automaticScriptPaths": false
}

By disabling this, teams could still set artillery.include" & yaml.schemas manually, for example:

{
    "artillery.automaticScriptPaths": false,
    "artillery.include": ["load-tests/**/*.yml"],
    "yaml.schemas": {
        "https://www.artillery.io/schema.json": [
            "load-tests/**/*.yml"
        ]
    }
}