Tipping Thank You/Confirmation should be inline

[ryanml]

Test Plan:

1. Enable Rewards
2. Opening the tipping banner for a publisher.
3. Send a Tip
4. Confirm that the old overlay does not show and instead the new inline confirmation shows up
5. Confirm that share links work as expected

[ryanml]

@jenn-rhim do we have a design for the new Monthly variant's confirmation? Not sure if we wanted to show one with the orange scheme. cc: @NejcZdovc

[GeetaSarvadnya]

Verification passed on

Brave	1.2.7 Chromium: 78.0.3904.108 (Official Build) dev (64-bit)
Revision	4b26898a39ee037623a72fcfb77279fce0e7d648-refs/branch-heads/3904@{#889}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the test plan from Adding inline tip confirmation brave-core#3789
• Logged Wallet balance is not updated dynamically after sending a tip #7047
  
  

Verification passed on

Brave	1.2.6 Chromium: 78.0.3904.97 (Official Build) dev (64-bit)
Revision	021b9028c246d820be17a10e5b393ee90f41375e-refs/branch-heads/3904@{#859}
OS	Ubuntu 18.04 LTS

• Verified the test plan from Adding inline tip confirmation brave-core#3789
  
  

Verification PASSED on macOS 10.15.2 x64 using the following build:

Brave	1.2.40 Chromium: 79.0.3945.88 (Official Build) (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	macOS Version 10.15.2 (Build 19C57)

• Verified that the STR mentioned via Tipping Thank You/Confirmation should be inline #6151 (comment) and Adding inline tip confirmation brave-core#3789 worked on both Staging and Production.