Add FXIOS-10603 Telemetry for pull refresh easter egg (backport #23252)

[mergify]

📜 Tickets

Jira ticket
Github issue

💡 Description

Add Telemetry for pull refresh easter egg and change pull refresh telemetry to event type.

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

---

This is an automatic backport of pull request #23252 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of a47b61c has failed:

On branch mergify/bp/release/v133/pr-23252
Your branch is up to date with 'origin/release/v133'.

You are currently cherry-picking commit a47b61cf8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   firefox-ios/Client/Telemetry/TelemetryWrapper.swift
	modified:   firefox-ios/Client/metrics.yaml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   firefox-ios/Client/Frontend/Browser/WebView/PullRefreshView.swift

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mobiletest-ci-bot]

	Messages
📖	Project coverage: 32.65%
📖	Edited 2 files
📖	Created 1 files

Client.app: Coverage: 30.67

File	Coverage
TelemetryWrapper.swift	71.47%	✅

Generated by 🚫 Danger Swift against 4041a6d

[FilippoZazzeroni]

This should be merged in case PullRefresh gets merged Pull refresh PR

[FilippoZazzeroni]

Closing since this feature is going in 134