Create Variable Code Action is not accurate for query expression

[malinthar]

Description: Consider the following scenario

Steps to reproduce:

public function main() {
    xml x1 = xml `<book>The Lost World</book>`;

    string[] xmlResult = from xml element in x1 select element.toBalString();
}

Affected Versions: 2201.2.x

[TharushiJay]

Blocked by https://github.com/ballerina-platform/ballerina-lang/issues/37450