[scss] Hover hint doesn't support SCSS Interpolation syntax

Issue Type: <b>Bug</b> When editing scss files I like to hover over the various nested elements to see how they would look in css. For example when hovering over: ``` .main { } ``` I see a hover hint of: <element class="main> However, when I use Sass Interplation (https://sass-lang.com/documentation/interpolation) syntax the hint isn't very helpful. For example, when hovering over: ``` .main { #{&}__paragraph{ } } ``` I see the hint as: ``` <element class="main"> ... <#{&}__paragraph> ``` Instead it should be: ``` <element class="main"> ... <element class="main__paragraph"> ``` When I see the css generated by the Sass compiler I can see that the resulting css should be: ``` .main { } .main .main__paragraph { } ``` And when I hover over these elements in the css file the hint is correct. So this means there is a bug in the hover hint for scss files when it comes to showing the hint correctly for elements using the interpolation syntax. VS Code version: Code 1.59.1 (3866c3553be8b268c8a7f8c0482c0c0177aa8bfa, 2021-08-19T11:56:46.957Z) OS version: Windows_NT x64 10.0.19043 Restricted Mode: No <details> <summary>System Info</summary> |Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (8 x 3392)| |GPU Status|2d_canvas: enabled<br>gpu_compositing: enabled<br>multiple_raster_threads: enabled_on<br>oop_rasterization: enabled<br>opengl: enabled_on<br>rasterization: enabled<br>skia_renderer: enabled_on<br>video_decode: enabled<br>vulkan: disabled_off<br>webgl: enabled<br>webgl2: enabled| |Load (avg)|undefined| |Memory (System)|15.90GB (4.00GB free)| |Process Argv|--folder-uri file:///c%3A/Users/Joshua/repos/SassLearning --crash-reporter-id c0dca655-d1df-45ff-ae92-5840c829bb11| |Screen Reader|no| |VM|0%| </details><details><summary>Extensions (3)</summary> Extension|Author (truncated)|Version ---|---|--- powershell|ms-|2021.8.0 live-sass|rit|3.0.0 LiveServer|rit|5.6.1 </details><details> <summary>A/B Experiments</summary> ``` vsliv368cf:30146710 vs…