Add `sso_started` track event

[mebarbosa]

Description

• Add sso_started Track event

Fixes #2366

Testing Instructions

1. Install the app
2. Tap on Continue with Google button
3. ✅ Ensure 🔵 Tracked: sso_started, Properties: {"source":"google" event is track

Checklist

• [x] If this is a user-facing change, I have added an entry in CHANGELOG.md
• [x] Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• [x] I have considered whether it makes sense to add tests for my changes
• [x] All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• [x] Any jetpack compose components I added or changed are covered by compose previews
• [x] I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

I have tested any UI changes...

• [x] with different themes
• [x] with a landscape orientation
• [x] with the device set to have a large display and font size
• [x] for accessibility with TalkBack