[PR #9644/250dc113 backport][stable-10] Fb keycloak client improvement

[patchback]

This is a backport of PR #9644 as merged into main (250dc11).

SUMMARY

Fix and improve existing tests for keycloak_client module

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

keycloak_client

ADDITIONAL INFORMATION

Run ansible-test integration -v keycloak_client --allow-unsupported --docker fedora40 --docker-network host

Before:

[...]
TASK [keycloak_client : Assert changes not detected in last two tasks (desire when same, and check)] ***
    task path: /root/ansible_collections/community/general/tests/output/.tmp/integration/keycloak_client-p3ttqf7d-ÅÑŚÌβŁÈ/tests/integration/targets/keycloak_client/tasks/main.yml:79
    fatal: [testhost]: FAILED! => {
        "assertion": "check_client_when_present_and_same is not changed",
        "changed": false,
        "evaluated_to": false,
        "msg": "Assertion failed"
    }
[...]

After:

[...]
TASK [keycloak_client : Assert changes not detected in last two tasks (desire when same, and check)] ***
task path: /root/ansible_collections/community/general/tests/output/.tmp/integration/keycloak_client-bhrae54u-ÅÑŚÌβŁÈ/tests/integration/targets/keycloak_client/tasks/main.yml:79
ok: [testhost] => {
    "changed": false,
    "msg": "All assertions passed"
}
[...]

[ansibullbot]

cc @eikef @mattock @ndclt @thomasbach-dev
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