Improve Data Reporting for Chromium Keychain User Actions

[aataraxiaa]

Task/Issue URL: https://app.asana.com/0/1206488453854252/1206886138223449/f

Description:

• Stop firing an error Pixel when the user cancels Keychain password entry
• Add new non-error pixel for user being prompted for Keychain password entry
  ** Name: m_mac_password_import_keychain_prompt
  ** Triggering condition: User selects ‘Import’ from a Chromium-based browser
  ** Parameter Names: None
  ** Why It’s Needed: To understand the rate at which users deny (see below Pixel) Keychain access, we need to compare ‘deny’ events to total number of keychain prompt events
• Add new non-error pixel for user denying keychain access event
  ** Name: m_mac_password_import_keychain_prompt_denied
  ** Triggering condition: User denies access to their keychain
  ** Parameter Names: None
  ** Why It’s Needed: We want to understand the the rate at which users deny keychain access

Steps to test this PR:

1. Run this code
2. Choose to import from Chrome
3. Confirm that the m_mac_password_import_keychain_prompt pixel is fired when the user is prompted to enter their keychain password
4. Deny access to the keychain
5. Confirm that the m_mac_password_import_keychain_prompt_denied pixel is fired when the user denies access to their keychain

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Internal references:

Pull Request Review Checklist
Software Engineering Expectations
Technical Design Template
Pull Request Documentation

[amddg44]

LGTM! 😄