Tweaks to autofill pixels for KPIs

[amddg44]

Task/Issue URL: https://app.asana.com/0/414235014887631/1207338955294273/f
Tech Design URL:
CC:

Description:
Updates logic slightly around the new pixels added as part of unified autofill KPIs across platforms

Steps to test this PR:

NOTE - if you have an existing build with 10 or more passwords, feel free to start with Step 9 & 10 first 🙂

1. Starting with a new install of the app, visit https://fill.dev/form/registration-username and save a new login using a generated password (triggering a fill event)
2. Confirm these pixels DO NOT fire: m.autofill.activeuser or m.autofill.logins.stacked
3. Perform a search in the browser
4. Confirm these pixels fire: m.autofill.activeuser and m.autofill.logins.stacked ["count_bucket": "few"]
5. Minimise the app and return to foreground + confirm this pixel fires: m.autofill.onboardeduser (defined as user who has stored at least 1 password within the first week)
6. Perform another search and confirm none of the above pixels fire again
7. Visit to https://fill.dev/form/login-simple and fill the previously saved login and again confirm none of the above pixels fire again
8. Delete and re-install the app
9. Save (or sync & import) 10+ logins and then perform a search
10. Confirm this pixel fires: m.autofill.enableduser (defined as a user who is a search DAU and has at least 10 passwords saved)

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than '

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 14
• iOS 15
• iOS 16

Theme Testing:

• Light theme
• Dark theme

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Internal references:

Software Engineering Expectations
Technical Design Template

[aataraxiaa]

Tested & LGTM @amddg44!