[ads] Sponsored Images & Videos option to New Tab Page setting (uplift to 1.70.x)

[aseren]

Uplift of #25108
Uplift of #25175
Uplift of #25285

Resolves brave/brave-browser#38198
Resolves brave/brave-browser#40507
Resolves brave/brave-browser#40605

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.

[btlechowski]

Verification passed on Brave v1.71.64 on iPhone 13 Pro Max (iOS 17.5.1)

brave/brave-browser#38198

Clean profile - first run - JP region in phone

Verified Media Type menu is shown for JP region and Sponsored Images & Videos is default one

Verified it has 3 options and Sponsored Images & Videos is default one

Verified video ad is shown

Clean profile - first run - JP region in phone - Sponsored Images

Verified video ad is not shown

Clean profile - first run - JP region in phone - Default Images

Verified video ad is not shown

Clean profile - changing locale

After changing locale to DE from JP, Sponsored Images is not selected, Logged

But Sponsored images are shown:

Clean profile - Enabled rewards - JP geolocation

Verified Media Type menu is shown for JP geolocation and Sponsored Images & Videos is default one

Enabled rewards - JP->US geolocation - default value

Verified Media Type menu is shown for US geolocation and Sponsored Images is default one

Enabled rewards - JP->US->JP geolocation - default value

Verified Media Type menu is shown for JP geolocation and Sponsored Images & Videos is default one

Enabled rewards - JP->US geolocation - Default Images

Verified Media Type menu is shown for US geolocation and Default Images is default one

Enabled rewards - JP->US->JP geolocation - Default Images

Verified Media Type menu is shown for JP geolocation and Default Images is default one

Enabled rewards - JP->US->JP geolocation - Sponsored Images

Verified Media Type menu is shown for JP geolocation and Sponsored Images is default one

upgrade - Default Images

On 1.70.x:

On 1.71.x

upgrade - Sponsored Images

On 1.70.x:

On 1.71.x

brave/brave-browser#40605

Verified test plan from brave/brave-browser#40605

Verified NTT video background is not empty

brave/brave-browser#40507

Brave.NTP.SponsoredMediaType - disabled

Brave.NTP.SponsoredMediaType - images

Brave.NTP.SponsoredMediaType - images & videos

[kjozwiak]

Uplift into 1.70.x approved 👍 QA has verified the PR on Nightly using 1.71.x as per #25326 (comment).