Type checker: recover function type unification in method checking

[auduchinok]

Adds recovery when it's not possible to unify the method type with the expected type:

if true then
    "".ToString

The error would lead to the method symbol not being reported, so features like 'Go to Declaration' or getting the tooltip would not work.

[github-actions[bot]]

:heavy_exclamation_mark: Release notes required

---

:white_check_mark: Found changes and release notes in following paths:

Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/11.0.0.md

[auduchinok]

This is ready 🙂