[MWPW-152968] mWeb - Passing ECID to Branch.io banner - Implementation

[drashti1712]

• When a user who has opted into both analytics and advertising cookies and is using Android device, their unique ECID is passed to Branch.
• These changes were approved and merged last month ( PR: 2567) but were later reverted as we needed to wait for PIA approval. We are now re-opening this PR as we have received the PIA approval for this.

Resolves: MWPW-152968

Test URLs:

• Before: https://main--milo--adobecom.hlx.live/drafts/drashti/milo-banner/branch-banner?martech=off
• After: https://branch-ecid--milo--drashti1712.hlx.live/drafts/drashti/milo-banner/branch-banner

[aem-code-sync[bot]]

	Page	Scores	Audits	Google
M	/drafts/drashti/milo-banner/branch-banner
D	/drafts/drashti/milo-banner/branch-banner

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.92%. Comparing base (2abe70f) to head (dcc46cb). Report is 22 commits behind head on stage.

Additional details and impacted files

@@           Coverage Diff           @@
##            stage    #2772   +/-   ##
=======================================
  Coverage   95.91%   95.92%           
=======================================
  Files         173      173           
  Lines       45831    45861   +30     
=======================================
+ Hits        43958    43990   +32     
+ Misses       1873     1871    -2     

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[github-actions[bot]]

This PR is currently in the needs-verification state. Please assign a QA engineer to verify the changes.

[spadmasa]

Validation done on the pr in the below url : https://main--cc--adobecom.hlx.page/drafts/Souj/branch-io/branch-io-page12?milolibs=branch-ecid--milo--drashti1712 ecid value is seen passed for android and seen matching in branch

details are updated in ticket https://jira.corp.adobe.com/browse/MWPW-152968