Part of #9080

Ref: pe5sF9-1xq-p2/#show-the-share-cta-in-product-form

Description

As part of improving the product sharing experience, we're exposing the "Share" menu item at any times, next to the ellipsis button, assuming the product is published and do not currently has any edits. In other words, whenever the "Publish" or "Save" menu item is not currently exposed next to the ellipsis button.

This also adds analytics to check which one is more performant: the exposed menu item, or the hidden-in-dropdown menu item. This is done by adding a source product_form or more_menu to the existing product_detail_share_button_tapped event. This is done to match the tracking added in iOS here.

Testing instructions

Display testing:

1. Start app, go to Products, and pick an already published product. Make sure the "Share" menu item is shown on top right.
2. Make changes to the product title. Ensure the button changes from "Share" to "Save".
3. Manually delete the added changes to the product title. Ensure the button changes back to "Share".
4. Go back, then create a new product using the Plus button.
5. Make sure on top right the "Publish" button is shown, and the "Share" button is not shown.
6. Do various other checks (e.g. by setting a product's status to draft) to ensure the Save/Publish buttons always has priority over the "Share" button.

Analytics testing:

1. Start app, go to Products, and pick an already published product. Make sure the "Share" menu item is shown on top right.
2. Tap "Share". Make sure something like this is shown: 🔵 Tracked: product_detail_share_button_tapped, Properties: {"source":"product_form"
3. Edit site title randomly, then tap ellipsis button on top right,
4. From the dropdown, tap "Share". Make sure something like this is shown: 🔵 Tracked: product_detail_share_button_tapped, Properties: {"source":"more_menu"