Ads-enabled metrics is shown in the local state file even after a month of installation/ads enabled

[GeetaSarvadnya]

Description

Found while testing #28109
Ads-enabled metrics is shown in the local state file even after a month of installation/ads enabled

Steps to Reproduce

1. Clean profile 1.51.x
2. Open brave://local-state file
3. Ensure that the metrics Brave.Rewards.EnabledInstallationTime not present in the local state file as expected
4. Enable the rewrads
5. Reload the brave://local-state file
6. Ensure that the metrics Brave.Rewards.EnabledInstallationTime response value is 0 as expected
7. Close the browser
8. Set the sys date ahead by one month
9. Relaunch the browser
10. Reload the brave://local-state file
11. the metrics Brave.Rewards.EnabledInstallationTime response value is 0 which is NOT as expected as per the test plan step 3 Add support for ephemeral P3A metrics, add ads enabled installation time metric brave-core#16897 (comment)

Actual result:

Ads-enabled metrics is shown in the local state file even after a month of installation/ads enabled

Expected result:

Not sure

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.51.79 Chromium: 112.0.5615.49 (Official Build) beta (64-bit)
Revision	bd2a7bcb881c11e8cfe3078709382934e3916914-refs/branch-heads/5615@{#936}
OS	Windows 10 Version 21H2 (Build 19044.2728)

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

cc: @DJAndries @brave/qa-team @mattmcalister

[GeetaSarvadnya]

The issue is reproducible on Samsung Galaxy version 12 running Bravemonoarm64.apk_1.51.79

[DJAndries]

@GeetaSarvadnya Did you use a MITM proxy to confirm that the metric was sent before advancing the system time?