fix: updated hide_credentials config option to false in key-auth realm

[shivaygupta-dotcom]

Konnect Job was failing because, keyAuth plugin in Test_Sync_ConsumerGroupsScopedPluginsKonnect was expecting false but value was set as true.
more details below
https://github.com/Kong/deck/actions/runs/24171827679/job/70544918353

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.52%. Comparing base (f1eaee1) to head (7fea168).
⚠️ Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1990   +/-   ##
=======================================
  Coverage   32.52%   32.52%           
=======================================
  Files          77       77           
  Lines        6914     6914           
=======================================
  Hits         2249     2249           
  Misses       4485     4485           
  Partials      180      180           

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