* added test case to try to retrieve duplicate refactor as in #50416. 'verify.refactorAvailable' correctly retrieves nonduplicate refactors...
* optional arguments in refactorAvailable return `true` even if there is no single refactor that satisfies both
* it still passes :C
* Delete fixExtractToInnerFunctionDuplicaton.ts
* deleted extra test code
* fix 'verify.refactorAvailable' so that tests correctly check for multiple arguments
* fixes#50416
* refactor