fix(es): Fix role name for Opensearch user

[pedro93]

Summary

Fixed bug where Elasticsearch Cloud user role name was being doubled (e.g., prefix_accessaccess instead of prefix_access).

Root Cause

The user template files had "roles":["PREFIXaccess"] instead of "roles":["PREFIX"]. When the code substituted PREFIX with the full role name (which already includes the _access suffix like dh_access), it resulted in a doubled suffix: dh_accessaccess.

Impact

This caused authentication failures when DataHub tried to connect to Elasticsearch with security exceptions like:

action [indices:data/read/search] is unauthorized for user [dh] 
with effective roles [] (assigned roles [dh_accessaccess] were not found)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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