Sharing: enable account selection dialog for Eventbrite

[designsimply]

Raised by @aduth

When connecting to an Eventbrite account from the Connections page, no account confirmation dialog is shown after the authorization has completed. Instead, it's assumed that the newest Keyring connection is to be used for the connection. This is potentially troubling in cases where a user may have more than one Eventbrite account they wish to use between one or more sites. It also forces a user to disconnect their existing connection before connecting to a different account.

We are limited to a single Eventbrite connection per site. The connection mechanism is different than Publicize in that we update a site setting using the /sites/%s/settings endpoint. The account selection dialog will need to be updated to account for these two caveats.

/cc @kwight

Comment from @designsimply

To test you will need:

• Two separate Evenbrite accounts
• A WordPress.com account with two sites

Steps to reproduce:

1. Go to https://wordpress.com/sharing and select the 1st WordPress.com site
2. Click Connect next to Eventbrite
3. If you were already logged in to Eventbrite, click Allow, otherwise log in
4. Confirm the 1st blog was connected to the 1st Eventbrite account
5. Click Switch Site
6. Click the 2nd WordPress.com blog
7. Click Sharing
8. Click Connect next to Eventbrite
9. Click the "not you?" link
10. Log in to the 2nd Eventbrite account
11. Close the pop-up window
12. Confirm the 2nd blog was connected to the 2nd Eventbrite account
13. If the wrong account connects, try logging out and back in to Eventbrite in a separate tab and try connecting again

Result: when I try to connect a 2nd Eventbrite account to a 2nd blog, it doesn't prompt me to select which account I want to authorize like other Sharing connections such as Twitter:

[stale]

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