New Tab Takeover infobar notice and Learn More link (uplift to 1.78.x)

[aseren]

Uplift of #28597
Resolves brave/brave-browser#45028

Uplift of #28203
Resolves brave/brave-browser#44766

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.

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• 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.

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[Info] chromium_src:
Located 2 #define statements.

[brave-builds]

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  android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageLayout.java:318: Use SharedPreferencesManager instead to access app-wide SharedPreferences from //src/chrome.
  android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageLayout.java:940: Use SharedPreferencesManager instead to access app-wide SharedPreferences from //src/chrome.
  android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageLayout.java:1426: If possible, please use #setTextAppearance to set one of the pre-defined text appearance styles in src/ui/android/java/res/values-v17/styles.xml, instead of using #setTextColor or #setTextSize. This will ensure that your programmatically set text styles stay in-sync with text styles used in the rest of Chrome. (crbug.com/775198)

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Please add @NullMarked and fix the NullAway warnings in the following files
(see https://chromium.googlesource.com/chromium/src/+/main/styleguide/java/nullaway.md):

Items:

android/java/org/chromium/chrome/browser/infobar/BraveInfoBarIdentifier.java
android/java/org/chromium/chrome/browser/ntp/BraveNewTabPageLayout.java
android/java/org/chromium/chrome/browser/ntp/BraveNewTabTakeoverInfobar.java
android/java/org/chromium/chrome/browser/settings/BackgroundImagesPreferences.java

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Found 1 lines longer than 80 characters (first 5 shown).

Items:

android/java/res/xml/background_images_preferences.xml, line 26, 88 chars

[brave-builds]

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

[kjozwiak]

Closing the above as discussed via Slack. @tmancey mentioned the above was discussed in the ads meeting and 1.79.x should be fine for the above.