Remove FXIOS-15286 [Telemetry] Ad cookies parsing not used

[janbrasna]

📜 Tickets

Jira ticket FXIOS-15286
GitHub issue #32826

💡 Description

The values collected JS–side are not utilized further by the native helpers. This has caused WebKit crashes so it would be better to remove completely if unused.

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If needed, I updated documentation and added comments to complex code

[janbrasna]

Before its PR even landed, it seems the only cookie parsing listed for bing eventually got removed in c144c34a within #8970 before the feature shipped. Nothing has shown since to be adding any use of this specific message data, so I'm assuming the collection on the document side is completely superfluous. @nbhasin2 Does that sound plausible from when this functionality was launched?

[janbrasna]

Looking at the adsMessageHandler processing it, I only ever see iterating over the links:

firefox-ios/firefox-ios/Client/Telemetry/AdsTelemetryHelper.swift

Lines 119 to 120 in 8308f2f

	let body = message.body as? [String: Any],
	let urls = body["urls"] as? [String] else { return }

but no cookie info (from message body["cookies"]) is ever parsed.

It also appears the whole message payload is never stored raw, so that would hint at only parsing the explicit values, which is currently just the links.

[mobiletest-ci-bot]

🧹 Tidy commit

Just 2 file(s) touched. Thanks for keeping it clean and review-friendly!

✅ New file code coverage

No new file detected so code coverage gate wasn't ran.

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