chore: Replace serde_yaml with yaml_serde

[xeniape]

Description

Part of stackabletech/issues#898

Integrationtests

--- PASS: kuttl (1513.53s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_opa-1.16.2_openshift-false_use-tls-false (101.77s)
        --- PASS: kuttl/harness/logging_opa-1.20.2_openshift-false (126.86s)
        --- PASS: kuttl/harness/workload-kind_opa-latest-1.20.2_openshift-false (48.95s)
        --- PASS: kuttl/harness/logging_opa-1.16.2_openshift-false (72.28s)
        --- PASS: kuttl/harness/config-overrides_opa-latest-1.20.2_openshift-false (58.66s)
        --- PASS: kuttl/harness/aas-user-info_opa-latest-1.20.2_openshift-false (140.12s)
        --- PASS: kuttl/harness/cluster-operation_opa-latest-1.20.2_openshift-false (51.15s)
        --- PASS: kuttl/harness/resources_opa-latest-1.20.2_openshift-false (19.62s)
        --- PASS: kuttl/harness/keycloak-user-info_opa-latest-1.20.2_keycloak-23.0.1_openshift-false (260.40s)
        --- PASS: kuttl/harness/openldap-user-info_opa-latest-1.20.2_openshift-false (132.68s)
        --- PASS: kuttl/harness/smoke_opa-1.20.2_openshift-false_use-tls-false (58.85s)
        --- PASS: kuttl/harness/smoke_opa-1.20.2_openshift-false_use-tls-true (54.49s)
        --- PASS: kuttl/harness/smoke_opa-1.16.2_openshift-false_use-tls-true (60.13s)
        --- PASS: kuttl/harness/data-hub-resource-info_opa-latest-1.20.2_trino-latest-483_kafka-latest-4.2.1_superset-latest-6.1.0_data-hub-1.0.3_data-hub-prerequisites-0.3.0_openshift-false (1314.37s)
PASS

Unittests

test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.09s

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[NickLarsenNZ]

LGTM