Keep separate NTT P3A events for Constellation metrics

[DJAndries]

In order to deprecate JSON reporting completely for iOS, we need to maintain separate NTT event counts for Constellation reporting. The rotated method in NewTabPageP3AHelper must acknowledge Constellation rotations.

[GeetaSarvadnya]

Verification INPROGRESS on iPhone 8 version 16.7.10 running on Brave Nightly 1.75 (118)

• Verified the test plan from Add Constellation support for express & slow P3A metrics brave-core#20264

Step 1_PASSED

• Confirmed that JSON metrics are sent as usual to the endpoint p3a-json.brave.com
• Confirmed that each metric is sent to the server and marked as "sent" = true in the local state file

randomness metrics at http://p3a-json.brave.com/

Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example

• Confirmed that if the metric is in the logs object (in local state), then the cadence is typical and the same is displayed in p3a-json.brave.com endpoint in the server

Example	Example	Example	Example	Example	Example

• Confirmed that, If the metric is in logs_slow then the cadence is slow and same is displayed in the p3a-json.brave.com endpoint in the server
  

• Confirmed that, If the metric is in logs_express then the cadence is express and the same is displayed in p3a-json.brave.com endpoint in the server

• Only 2 metrics are shown under the logs_express and in p3a-json endpoint, I could see two cadence express metrics sent to the endpoint p3a-json.brave.com

Example	p3a-json.brave.com	p3a-json.brave.com

• Only 1 metrics are shown under logs_slow both metrics are shown under https://p3a-json.brave.com as expected

Example	Example

• Confirmed that the cadence field in the payload contains the correct value
• The metrics Brave.Shields.AdBlockSettings response value is same on both local state file and p3a-json... endpoint

local-state	p3a-json	local-state	p3a-json	local-state	p3a-json	local-state	p3a-json	ocal-state	p3a-json