remove twitter panel support

[LaurenWags]

Description

Due to #5580 we discussed removing panel support if that issue cannot be resolved in time for 0.69.x release.

This is to track that discussion.

Miscellaneous Information:

@kjozwiak and @LaurenWags to verify that tipping only via in-line tip button (not using the panel at all) does not result in mismatch/tipping incorrect twitter user.

Placed this into 0.69.x milestone per discussion with @rebron - please move out if necessary.

[LaurenWags]

Closing this as I was able to reproduce twitter mismatch without ever utilizing (opening) the panel. I followed the steps in #5580 and tipped verified and unverified twitter users entirely with in-line tipping and was still able to reproduce a mis-match.

Attempting to tip twitter.com/brave looks like it resulted in a tip to twitter.com/bravelaurenwags instead:

However, upon further inspection, (looking at the pending table), the tip appears to have gone to a 3rd (different) user entirely - the URL at the bottom highlighted in the purple box does NOT match the user in the red box:

[LaurenWags]

cc @rebron @kjozwiak @NejcZdovc

Happy to provide further information if needed.

[LaurenWags]

Per request, I also checked this without using in-line tips and ONLY tipped via panel. Still received mismatch:

1. Clean profile on 0.69.x

2. Enable Rewards

3. Navigate to twitter.com and login

4. Navigate to a page, tip thru panel. (user was unverified, not sure if this matters)

5. Navigate to another twitter page.

6. Open panel --> see mismatch on panel, shows previous user info.
   

7. Ignore and click on send tip anyway.

8. Tip banner opens --> still mismatch. URL says kamiljozwiak but banner says different user.
   

[kjozwiak]

Awesome work @LaurenWags 👍 Thanks for investigating! Looks like we'll need to basically fix Twitter tipping as it's completely broken right now as @LaurenWags proved above.

@rebron @davidtemkin @NejcZdovc @bsclifton we'll need to fix #5580 to get Twitter into a working state.