Add notes to Tip-panel and Tip-banner for unverified publishers

[mandar-brave]

Add Note to Tip-Panel below the Send-Tip button

Note: has not signed up to claim your contributions. Click here to contribute only to sites that have signed up.

Link, when clicked, will auto-toggle the settings on Brave-Rewards for Auto-contribute and Tips to OFF for unverified publishers

Add Note to Tip-Banner

Note: This creator has not yet signed up to claim tips from Brave users, but we hope they will soon! For more info, click here <link: https://brave.com/faq-rewards/#unclaimed-funds>

[jenn-rhim]

Here is the fix.

*Be sure to change the copy in the main content area: 'Content creators get paid...' to 'Verified content creators...' --> this is for all banners, banner with or without the disclaimer box at the top.

@NejcZdovc @mandar-brave

[davidtemkin]

@NejcZdovc @mandar-brave @jenn-rhim

In the BR panel, the link/button "Change Auto-Contribute Settings" should only appear if a user has enabled Auto-Contribute as a whole.

If A-C is on, the link/button should appear even if the user has previously disabled "allow contribution to non-verified sites" in A-C settings.

[davidtemkin]

When a user presses "Change Auto-Contribute Settings", the user should be taken to the Brave Rewards settings page, with Auto-Contribute settings pre-opened. @NejcZdovc

[mandar-brave]

@NejcZdovc removed the original references now that we have the newly designed images from @jenn-rhim

[kjozwiak]

Went through verifications on the following platforms:

• macOS 10.14.2 x64 - Verification PASSED
• Ubuntu 18.04.1 x64 VM - Verification PASSED

Used the following build:

Brave	0.58.17 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}

Test Cases:

• ensured that Learn more under the Rewards panel takes the user to https://brave.com/faq-rewards/#unclaimed-funds
• ensured that Learn more under the Tip banner panel opens https://brave.com/faq-rewards/#unclaimed-funds
• ensured that Change Auto-Contribution Settings under the Rewards panel opens brave://rewards/#ac-settings
• ensured that Change Auto-Contribute settings is being displayed under the Rewards panel when Allow contribution to non-verified sites is enabled via chrome://rewards/#ac-settings
• ensured that Change Auto-Contribute settings doesn't appear under the Rewards panel when Allow contribution to non-verified sites is disabled via chrome://rewards/#ac-settings