chore: add handling for alias events in tracked users report

[mihir20]

Description

We will add previousID that we received in the identifiedAnonID bucket so that it will be substracted from the total count. e.g

e.g. we receive events
		{type:track, anonymousID: anon1}
		{type:track, userID: user1}
		{type:track, userID: user2}
		{type:identify, userID: user1, anonymousID: anon1}
		{type:alias, previousId: user2, userID: user1}
		
		userHLL: {user1, user2}, 
		anonHLL: {anon1}, 
		identifiedAnonHLL: {user1-anon1, user2}
		
		cardinality: len(userHLL)+len(anonHLL)-len(identifiedAnonHLL): 2+1-2 = 1

https://www.rudderstack.com/docs/event-spec/standard-events/alias/

ref: https://rudderlabs.slack.com/archives/C075KC5G81G/p1720670222299599

Linear Ticket

https://linear.app/rudderstack/issue/PIPE-1305/add-handling-for-alias-events-in-mtu

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.48%. Comparing base (95f402d) to head (343e150).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4899      +/-   ##
==========================================
+ Coverage   74.39%   74.48%   +0.09%     
==========================================
  Files         428      428              
  Lines       49763    49768       +5     
==========================================
+ Hits        37019    37070      +51     
+ Misses      10301    10258      -43     
+ Partials     2443     2440       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[satishrudderstack]

Why are we only looking at the first entry in batch and not all entries ?

[mihir20]

Each batch will have only have 1 event. Even if on gateway we receive a batch request we break that down and we create a new entry for each event in a batch. and each entry will be like {"batch":[{event...}]}