No feedback provided if invalid files (non-existent/missing) for copilot instructions

[brandon-software]

Type: Bug

Specify a non-existent file

"github.copilot.chat.experimental.codeGeneration.instructions": [
{
"file": "~/.copilot/non_existent_gen_instruction.md"
}
]

Extension version: 0.21.2
VS Code version: Code 1.94.1 (e10f2369d0d9614a452462f2e01cdc4aa9486296, 2024-10-05T05:44:32.189Z)
OS version: Darwin x64 24.0.0
Modes:
Remote OS version: Linux x64 6.10.4-linuxkit

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz (16 x 2300)
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 skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 2, 2
Memory (System)	32.00GB (0.11GB free)
Process Argv	--crash-reporter-id 97ffd719-b1cc-41e5-a29a-c642ca05b2ee
Screen Reader	no
VM	0%

Item	Value
Remote	Dev Container: Alpine @ desktop-linux
OS	Linux x64 6.10.4-linuxkit
CPUs	Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz (16 x 0)
Memory (System)	7.65GB (3.68GB free)
VM	0%

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