Add more tracking for MetaMask

[dan437]

Explanation

This PR adds some more tracking for MetaMask:

• App Installed (only if a user opted into metrics)
• signup_date tracking via traits
• Support Link Clicked for all links that use the SUPPORT_REQUEST_LINK constant
• New Wallet Created event after a user clicks on Remind me later (skips seed backup)
• App Uninstalled via a URL that needs to be implemented first, currently this code is disabled
• Track Support Link Clicked events also for the SUPPORT_LINK constant

Manual Testing Steps

App Installed and New Wallet Created events

• Remove the extension
• In scripts/background.js remove this condition: !(process.env.METAMASK_DEBUG || process.env.IN_TEST) from the browser.runtime.onInstalled listener
• Run yarn start
• Install the extension
• Check the background.html dev tools, specifically the Network tab and search for batch, which shows our tracking requests
• After you enable metrics, you will see that the App Installed event is tracked
• Create a new wallet and look for the New Wallet Created event when you click on Remind me later to skip seed backup

Support Link Clicked

• Open the extension, click on your profile (top right corner)
• Click on Support, which opens a new tab
• Verify that the Support Link Clicked event was tracked if you allowed tracking

[github-actions[bot]]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[brad-decker]

@worldlyjohn Could you review the schema/format of these events?

[worldlyjohn]

aside from moving signup_date from event property to user trait... everything else looks good from a schema POV!

[brad-decker]

re-triggered tests cause the unit test failure is a flaky test