add pixels for sync flows

[SabrinaTardio]

Please review the release process for BrowserServicesKit here.

Required:

Task/Issue URL: https://app.asana.com/0/0/1206317026096580/f
iOS PR: duckduckgo/iOS#2332
macOS PR: duckduckgo/macos-browser#2056
What kind of version bump will this require?: Patch

Optional:

Description: Adds debugs Pixels for errors encountered during sync setup flow and sync enabled flow.

Steps to test this PR:

1. Check that no pixel are sent for errors while no network connection
2. Hack DDGSync code to throw an error for example from disconnect
3. make it throw server related error ( noResponseBody, unexpectedStatusCode, unexpectedResponseBody) and check no pixel is fired.
4. make it throw other types of sync errors and check that the syncLogoutError pixel is sent having as parameter the relevant sync error.
5. Try other possible pixels: syncSignupError, syncLoginError, syncLogoutError, syncUpdateDeviceError, syncRemoveDeviceError, syncDeleteAccountError, syncLoginExistingAccountError, syncCannotCreateRecoveryPDF(which should have no parameter).

<!—
Before submitting a PR, please ensure you have tested the combinations you expect the reviewer to test, then delete configurations you know do not need explicit testing.

Using a simulator where a physical device is unavailable is acceptable.
—>

OS Testing:

• iOS 14
• iOS 15
• iOS 16
• macOS 10.15
• macOS 11
• macOS 12

—

Internal references:

Software Engineering Expectations
Technical Design Template

[ayoy]

LGTM :)

[SabrinaTardio]

Required:

Task/Issue URL: https://app.asana.com/0/0/1206317026096580/f
iOS PR: duckduckgo/iOS#2332
macOS PR: duckduckgo/macos-browser#2056
What kind of version bump will this require?: Patch

Optional:

Description: Adds debugs Pixels for errors encountered during sync setup flow and sync enabled flow.