Task API for ShellExecutionOptions.env type does not support undefined values

[karthiknadig]

Type: Bug

The TerminalOptions.env API supports environment variable values that include both string | undefined.

The ask is for this to match the TerminalOptions API.

Usage:
We plan on using this in the Python extension where users can contribute environment variables via .env files. We want to make sure the experience is same for the env variable merge in both cases.

VS Code version: Code - Insiders 1.96.0-insider (69acde7, 2024-11-21T05:04:38.064Z)
OS version: Windows_NT x64 10.0.26100
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz (8 x 1498)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on 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 vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.60GB (12.74GB free)
Process Argv	--log trace --log ms-python.python=info --crash-reporter-id 4fb1ebc1-cf4c-4880-a88a-47738ec3768d
Screen Reader	no
VM	0%

Extensions (18)

Extension	Author (truncated)	Version
tsl-problem-matcher	amo	0.6.2
ruff	cha	2024.54.0
esbuild-problem-matchers	con	0.0.3
vscode-eslint	dba	3.0.10
gitlens	eam	16.0.2
EditorConfig	Edi	0.16.4
prettier-vscode	esb	11.0.0
copilot	Git	1.245.1221
copilot-chat	Git	0.23.2024112103
vscode-github-actions	git	0.27.0
vscode-pull-request-github	Git	0.101.2024112104
debugpy	ms-	2024.13.2024111901
python	ms-	2024.21.0-dev
vscode-pylance	ms-	2024.11.101
remote-containers	ms-	0.388.0
remote-wsl	ms-	0.88.5
extension-test-runner	ms-	0.0.12
code-spell-checker	str	4.0.21

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