Update to use new paket syntax when running as local tool

[JustinGrote]

Issue Type: Bug

These warnings appear in the output pane when using paket with .net 6.0 rc2

Running paket as local tool
Paket version 6.2.1+c82f25d6c324024cbd231df154a447a117c2546e
Please use the new syntax: 'nuget' is the default argument and should be omitted.
Please use the new syntax: 'project' has been replaced by '--project'.

Extension version: 2.0.0
VS Code version: Code - Insiders 1.62.0-insider (bcb9df5afa52c5b713f62e86dcac2c5050504b5f, 2021-10-22T05:15:25.330Z)
OS version: Windows_NT x64 10.0.19042
Restricted Mode: No

System Info

Item	Value
CPUs	AMD Ryzen 5 2600 Six-Core Processor (12 x 3850)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.95GB (7.66GB free)
Process Argv	--crash-reporter-id d15abc04-2f14-48d4-98ba-287dac26245f
Screen Reader	no
VM	0%

A/B Experiments

vsliv695:30137379
vsins829:30139715
vsliv368:30146709
vsreu685:30147344
python383:30185418
pythonvspyt602:30291494
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pythonvspyt639:30291487
pythontb:30258533
pythonvspyt551cf:30291413
pythonptprofiler:30281269
vshan820:30294714
pythondataviewer:30285072
pythonvsuse255:30319630
vscod805:30301674
pythonvspyt200:30323110
vsccppwt:30382699
pythonvssor306:30340298
bridge0708:30335490
pygetstartedt2:30353727
bridge0723:30353136
pythonrunftest32:30365365
pythonf5test824:30361779
javagetstartedt:30350119
pythonvspyt187:30365360
pydsgst2:30361790
vsaa593:30376534
vscrecpromptt1:30387007

[baronfel]

Good spot, the required fix would be here and here. To do it though we'd probably want to run paket --version first and alter the syntax based on the version the user is running in the current workspace. Would you be interested in doing any of this?