[BUG] admin:admin change requires Java to be installed

[DarshitChanpura]

With current implementation of admin:admin change one of the requirements is to use Hasher to generate password on the fly to replace it in internal_users.yml. This makes it a requirement to have Java to be installed.

security/tools/install_demo_configuration.sh

Line 411 in 6b0b682

HASHED_ADMIN_PASSWORD=$($OPENSEARCH_PLUGINS_DIR/opensearch-security/tools/hash.sh -p "$ADMIN_PASSWORD" | tail -n 1)

Exit Criteria:

• Revert all changes related to admin:admin in 2.11
• Figure out best path forward so this is completely tested before it goes in future release.