duplicate @mention suggestions

[nathaniel-palmer-simplisafe]

Type: Bug

When @mentioning another user in a PR comment I get duplicate autocomplete results for every user. For context I'm working with private organization repos so all the autocomplete options are for members of the organization. In addition I don't see duplicate results when adding reviewers.

Extension version: 0.71.2023083109
VS Code version: Code - Insiders 1.82.0-insider (Universal) (f1302be1e67e3af5fbeb8bbb2ea784de7bc96150, 2023-09-01T11:10:56.707Z)
OS version: Darwin x64 22.6.0
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz (12 x 2600)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	3, 3, 3
Memory (System)	32.00GB (0.15GB free)
Process Argv	--crash-reporter-id f26317e5-9fc3-4785-9e60-10efe7dbb74e
Screen Reader	no
VM	0%

A/B Experiments

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[alexr00]

Fixed by #5232