[MWPW-163539] Update RCP workflow

[overmyheadandbody]

This tries to address a few issues with the current RCP workflow logic:

• don't block the merge to stage pipe for RCPs shorter than 24h. The merge to main pipe will continue to be blocked;
• don't send Slack notifications for RCPs lasting less than a day to avoid confusion;
• adapt the logic that decides when to send the Slack notifications to avoid sending the same alert multiple times;
• take the offset into account for the isWithinRCP method;
• declare the number of minimum required SOT approvals as a secret.

Resolves: MWPW-163539

Test URLs:

• Before: https://main--milo--overmyheadandbody.aem.page/?martech=off
• After: https://upate-rcp-workflow--milo--overmyheadandbody.aem.page/?martech=off

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/?martech=off
🖥️	/?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.39%. Comparing base (afe9047) to head (1655779).
Report is 111 commits behind head on stage.

Additional details and impacted files

@@           Coverage Diff           @@
##            stage    #3296   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files         245      245           
  Lines       56746    56746           
=======================================
  Hits        54698    54698           
  Misses       2048     2048           

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[github-actions]

Reminder to set the Ready for Stage label - to queue this to get merged to stage & production.