[NOJIRA] Support for Arm SLT and zap

[sarthak shaha (Sarthak-Shaha)]

Issue Link:
[NOJIRA]

Description of Problem/Feature:
Need to use machine specific zap and slt

Description of Fix/Solution:
Updated to use machine() to get machine specific slt and zap

Testing Done:
https://github.com/SiliconLabsSoftware/matter_extension/actions/runs/34620304216
CI

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-11T16:10:38.297050Z	d8cbdbc	PR opened

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Reviewed commit: d8cbdbc5c4

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[sarthak shaha (Sarthak-Shaha)]

bugbot run

[cursor]

PR Summary

Low Risk
Only affects local/CI tool bootstrap URLs in the setup script; no runtime product or security paths change, with main risk being a wrong arch label on an unsupported host.

Overview
sl_setup_env.py now picks SLT CLI and ZAP download URLs from the host CPU instead of always using x64.

On macOS it sets host_arch via platform.machine() (arm64 vs x64) and uses that in the zip names. SLT CLI is bumped from 1.1.1 to 1.2.2. Platform handling in set_platform_vars is slightly cleaned up to use self.platform consistently.

^{Reviewed by Cursor Bugbot for commit 749f7be. Configure here.}

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 749f7be. Configure here.}