application_store_snapshot event does not show up in Tracks for iOS

[jaclync]

Ref p1693330596268339/1692625489.705669-slack-C039133E1M3

Describe the bug

Even though we implemented the Tracks event in #10484, we didn't see any events in Tracks after a day of release.

After a deeper look, I found a silent validation error on the event properties because the property name can only contain alpha characters and underscores while the payment gateway properties have -: Custom properties dictionary keys must contain alpha characters and underscores only.

Validation errors like this aren’t logged to the console at all, and were missed during development/review. I should have made sure the Tracks event appears after a day or so. I’m also looking into the Tracks library why the error messages aren’t shown in console while it’s supposed to separately in Automattic/Automattic-Tracks-iOS#262.

To Reproduce
Steps to reproduce the behavior:

• Reinstall the app, or log in to a store whose snapshot hasn't been tracked
• Log in and connect to a store --> shortly after entering the site, an event is logged in the console 🔵 Tracked application_store_snapshot but it doesn't get sent in the Tracks POST request after a bit

Expected behavior

The Tracks event should be included in the POST request and show up in Tracks.

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only WooCommerce plugin is active.
• This bug happens with a default WordPress theme active, or Storefront.
• I can reproduce this bug consistently using the steps above.

Mobile Environment
Please include:

• Device: any
• iOS version: any
• WooCommerce iOS version: 15.1

WordPress Environment

``` Copy and paste the system status report from **WooCommerce > System Status** in WordPress admin. ```

[peril-woocommerce]

	Fails
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