Update cypress tests to set OPENSEARCH_INITIAL_ADMIN_PASSWORD env variable

[cwperks]

Description

Updates the SAML and OIDC Cypress tests to set OPENSEARCH_INITIAL_ADMIN_PASSWORD env variable.

Category

Test fix

Check List

• New functionality includes testing
• New functionality has been documented
• 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 (a889429) 67.09% compared to head (9fef54e) 67.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1706   +/-   ##
=======================================
  Coverage   67.09%   67.09%           
=======================================
  Files          94       94           
  Lines        2404     2404           
  Branches      318      318           
=======================================
  Hits         1613     1613           
  Misses        713      713           
  Partials       78       78           

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[cwperks]

Closing in favor of #1707