chore: rename advertiserId to pixelId for reddit pixel

[Gauravudia]

What are the changes introduced in this PR?

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What is the related Linear task?

Resolves INT-XXX

Please explain the objectives of your changes below

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Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

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Any new dependencies introduced with this change?

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Any new checks got introduced or modified in test suites. Please explain the changes.

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Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• I have executed schemaGenerator tests and updated schema if needed

• Are sensitive fields marked as secret in definition config?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (hotfix/26th.Feb@bd8315a). Click here to learn what that means.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             hotfix/26th.Feb     #1239   +/-   ##
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  Coverage                   ?   100.00%           
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  Files                      ?         2           
  Lines                      ?        53           
  Branches                   ?         7           
===================================================
  Hits                       ?        53           
  Misses                     ?         0           
  Partials                   ?         0           

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