mapTextChangesToCodeEditsUsingScriptInfo: Handle tsconfig.json text change

[ghost]

Noticed while looking at #24857 -- there's no ScriptInfo for a tsconfig.json file so we have to use a union.

[ghost]

Latest commit fixes #24857. The problem was that when b.ts is renamed, it becomes part of an inferred project because tsconfig.json only lists certain files. Since we were using program.getSourceFile() to test for file existence, that failed when the file was moved outside of the program.

[sheetalkamat]

Why do you need this? You can look determine if its sourceFile(config) by just checking

function isConfigFile(config: SourceFile | ScriptInfo) : config is SourceFile {
(config as SourceFile).kind !== undefined; 
}