Move internals out of ui folder

[NejcZdovc]

Currently in we have internals folder inside components/brave_rewards/resources/ui folder, which actually represents rewards settings page. So we have page inside the page where this pages are different. We should split them and move internals in this folder components/brave_rewards/resources

[btlechowski]

Verification passed on

Brave	0.71.93 Chromium: 77.0.3865.90 (Official Build) dev (64-bit)
Revision	58c425ba843df2918d9d4b409331972646c393dd-refs/branch-heads/3865@{#830}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#3462

Verified brave://rewards page

Verified rewards banner

Verified brave://rewards-internals page

Verified on clean profile and upgrade from 0.70.x

Verification passed on

Brave	0.71.94 Chromium: 77.0.3865.90 (Official Build) dev (64-bit)
Revision	58c425ba843df2918d9d4b409331972646c393dd-refs/branch-heads/3865@{#830}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the test pan from Reorganize resources in rewards folder brave-core#3462
• Verified on both new and upgraded profile
• Verified brave://rewrds-internals page load
  

Verified passed with

Brave	0.71.103 Chromium: 78.0.3904.70 (Official Build) beta (64-bit)
Revision	edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch-heads/3904@{#800}
OS	macOS Version 10.13.6 (Build 17G5019)

• Verified test plan from Reorganize resources in rewards folder brave-core#3462
• Confirmed brave://rewards and brave://rewards-internals pages load
• Confirmed tip banners load for Verified, Connected, and Unverified publishers (custom and default banners:
  Verified publisher:

Unverified publisher:

Connected publisher: