Make NTP SI kCountsResetTimeDelay configurable via griffin/feature

[btlechowski]

This blocks testing of #31551

kCountsResetTimeDelay was introduced via brave/brave-core#19823

Brave version (brave://version info)

Brave	1.60.87 Chromium: 118.0.5993.70 (Official Build) beta (64-bit)
Revision	854c1e600054dfca6842cebaf729f100f4b0f066
OS	Linux

cc @tmancey @aseren @petemill

[LaurenWags]

Discussing this one with @btlechowski as it relates to testing #31551.

From my understanding #31551 requires us to keep the browser open for 24hours. This really isn't feasible for us as we can't be stuck on testing a particular issue for that long. Making this value configurable will help and allow us to test easier. As far as I know, changing the clock while the browser is open will not yield the results that we need.

@petemill if our understanding is incorrect here, please let us know.

cc @kjozwiak @rebron

[kjozwiak]

The above requires 1.60.102 or higher for 1.60.x verification. @btlechowski feel free to change the QA/Yes flag if needed as the above is basically needed to run through #31551 easier rather than waiting the ~24hrs. I'm not sure if you want to add any verification notes within this one.

[btlechowski]

Verified with

Brave	1.60.102 Chromium: 118.0.5993.96 (Official Build) beta (64-bit)
Revision	3598a9fc6b7752181feb25caa131bc386d6d054c
OS	Linux

opted out

Verified the initial time is reset after 1 minute
Flags used:

BraveNTPBrandedWallpaper:initial_count_to_branded_wallpaper/1/count_to_branded_wallpaper/5/reset_counter_after/1m

1st NTP SI on 2nd NTP:

2nd NTP SI on 4th NTP:

opted in

Flags used:

BraveNTPBrandedWallpaper:initial_count_to_branded_wallpaper/1/count_to_branded_wallpaper/5/reset_counter_after/1m

1st NTP SI on 2nd NTP:

2nd NTP SI on 4th NTP: