Support disable cookie for webhook

[Hailong-am]

Description

Support disable cookie for webhook by add a new cluster level setting

PUT _cluster/settings
{
  "transient": {
    "opensearch.notifications.core.webhook.disable_http_cookie": true
  }
}

Issues Resolved

#822

Check List

• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (74de907) 66.93% compared to head (9882d74) 66.93%.
Report is 1 commits behind head on main.

❗ Current head 9882d74 differs from pull request most recent head 69d4b3d. Consider uploading reports for the commit 69d4b3d to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #823   +/-   ##
=========================================
  Coverage     66.93%   66.93%           
  Complexity      267      267           
=========================================
  Files            39       39           
  Lines          1742     1742           
  Branches        165      165           
=========================================
  Hits           1166     1166           
  Misses          453      453           
  Partials        123      123           

Flag	Coverage Δ
opensearch-notifications	66.93% <ø> (ø)

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