Need to set the timeout to transition out the tipping feedback screen

[jenn-rhim]

Description

The 'Thank you' screen' after sending tip button is clicked needs to be a transient feedback screen that shouldn't require the user's click to close. The initial design intent was to add an animation for the transitioning it out.

- Propose to set a timeout on this screen at 3 sec, ease out.

Expected result:

Reproduces how often:

Brave version (brave://version info)

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?
• Does it reproduce on browser-laptop?

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
• Is the issue reproducible on the latest version of Chrome?

Additional Information

[petemill]

@NejcZdovc I'm going to un-assign from myself for now since this can be achieved in the JS for the donate page. Whoever gets to this can call the dialog close JS after a timeout.

[LaurenWags]

Verified passed with

Brave	0.58.11 Chromium: 71.0.3578.80 (Official Build) beta(64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Mac OS X

• Verified test plan from Site banner now transitions to closed after three seconds when a donation has completed brave-core#801

Verification passed on

Brave	0.58.11 Chromium: 71.0.3578.80 (Official Build) beta (64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Windows 7 x64

Used STR from brave/brave-core#801

Verification passed on

Brave	0.58.11 Chromium: 71.0.3578.80 (Official Build) beta(64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Linux

• Verified banner is closed after 3 seconds