Added select theme UI to the new onboarding flow uplift to 1.47.x

[nullhook]

Uplift of #16326
Resolves brave/brave-browser#27170

Pre-approval checklist:

• You have tested your change on Nightly.
• This contains text which needs to be translated.
  • There are more than 7 days before the release.
  • I've notified folks in #l10n on Slack that translations are needed.
• The PR milestones match the branch they are landing to.

Pre-merge checklist:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.

Post-merge checklist:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

@nullhook mind taking a look? Looks like Win, macOS and Linux are failing due to components\brave_welcome_ui\components\select-theme\style.ts failing as per the following:

[2022-12-21T09:34:11.132Z] 
[2022-12-21T09:34:11.132Z] > brave-core@1.47.138 eslint
[2022-12-21T09:34:11.132Z] > eslint -c .eslintrc.json ./components
[2022-12-21T09:34:11.132Z] 
[2022-12-21T09:34:44.379Z] 
[2022-12-21T09:34:44.379Z] C:\ws\src\brave\components\brave_welcome_ui\components\select-theme\style.ts
[2022-12-21T09:34:44.379Z]   1:1  error  incorrect license  licenses/header
[2022-12-21T09:34:44.379Z] 
[2022-12-21T09:34:44.379Z] ✖ 1 problem (1 error, 0 warnings)
[2022-12-21T09:34:44.379Z]   1 error and 0 warnings potentially fixable with the `--fix` option.
[2022-12-21T09:34:44.379Z] 
script returned exit code 1

[brave-builds]

A Storybook has been deployed to preview UI for the latest push

[kjozwiak]

Uplift into 1.47.x approved 👍 QA has verified the PR on Nightly as per #16326 (comment).

[github-actions]

⚠️ PR head is an unsigned commit
commit: 9bffe3e
reason: unsigned
Please follow the handbook to configure commit signing
cc: @nullhook