Revert "util: Check whether discovered powershell is actually executable" (#43247) (cherry-pick to stable)

[zed-zippy]

Cherry-pick of #43247 to stable

---

Reverts #43044
Closes #43224

This slows down startup on windows significantly

Release Notes:

• Fixed slow startup on Windows

[ConradIrwin]

@Veykril does running with -NoProfile resolve the issue?

[Veykril]

No, the issue is that windows defender might slow down the process spawn here considerably and god dammit, this was supposed to land on the stable release earlier ...

[vickyqt]

it was slow but i didn't notice that much cuz I added zed.exe in defender exclusions.

[albertosantini]

Sorry to bother you...

Here (7 seconds) the same for node executable search?

2025-11-25T09:17:17+01:00 INFO  [project::prettier_store] Initializing default prettier with plugins {}
2025-11-25T09:17:24+01:00 INFO  [node_runtime] using Node.js found on PATH: SystemNodeRuntime { node: "C:\\Program Files\\nodejs\\node.exe", npm: "C:\\Program Files\\nodejs\\npm.cmd", global_node_modules: "C:\\Users\\alberto.santini\\AppData\\Local\\Programs\\Zed\\${APPDATA}\\npm\\node_modules\n", scratch_dir: "C:\\Users\\alberto.santini\\AppData\\Local\\Zed\\node" }

If it is the case, I open an issue. Thanks