Update Imports On File Move: alert the user when they're not using the correct TS version

[miguelsolorio]

Issue Type: Bug

Testing #50488

If the user has the "javascript.updateImportsOnFileMove" setting enabled but hasn't set the correct version of TypeScript, we should alert the user that they need to select the correct version. It would be even better if it asked if they want to let VS Code do it for them.

VS Code version: Code - Insiders 1.24.0-insider (bfd155e, 2018-05-29T06:13:09.810Z)
OS version: Darwin x64 17.5.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled vpx_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	4, 4, 4
Memory (System)	16.00GB (0.62GB free)
Process Argv	/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron -psn_0_5203190
Screen Reader	no
VM	20%

[mjbvz]

Good suggestion but I don't think it is worth the effort and maintenance cost. The vast majority of our uses are using the workspace version of typescript which does support this feature. Users will only not see this feature if they have specifically opted to use an older workspace version of TypeScript (in which case, they likely do not want to change their version)