Add warning to collect-wsl-logs.ps1 to be displayed when tool is missing

[andremueiot]

Summary of the Pull Request

On executing the log collection script, it will first confirm the required tools tcpdump and iptables are installed. For each tool
missing a warning is displayed, reminding the user that the tool should be installed prior to executing the script to get a more
complete log collection.

PR Checklist

• Closes: collect-wsl-logs.ps1 should warn users when a required tool is not installed #14427
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: No automated test is deemed necessary to cover the scenarios
• Localization: Wrote warning in plain English, like the messages already present in the log collection script
• Dev docs: No doc update needed
• Documentation updated: No doc update needed

Validation Steps Performed

Ran the command below (from log collection instructions) manually in both scenarios where tools are installed and not installed.
Visually confirmed that both warning messages show up when the respective tool is not installed.
.\collect-wsl-logs.ps1 -LogProfile networking

[Copilot]

Pull request overview

Adds pre-flight warnings to the Windows-side diagnostics/collect-wsl-logs.ps1 script to inform users (when running the networking log profile) that certain Linux tools should be installed in WSL for more complete log capture.

Changes:

• Introduces Test-WslApplication to probe for required tools inside WSL and emit Write-Warning when missing.
• Calls the new check for tcpdump and iptables when -LogProfile networking is selected.

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[Copilot]

Pull request overview

Adds preflight checks to the WSL log collection workflow so the networking profile warns users when key in-WSL tools are missing, helping avoid incomplete diagnostics for networking issues.

Changes:

• Introduce Test-WslApplication to probe for tool presence inside WSL via command -v.
• Emit warnings for missing tcpdump / iptables when -LogProfile networking is selected.

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[keith-horton]

@benhillis , what would be the process to ingest this change?