chore: Replace serde_yaml with yaml_serde

[xeniape]

Description

Part of stackabletech/issues#898

Integrationtests

--- PASS: kuttl (1734.01s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/ldap_superset-6.1.0_ldap-authentication-server-verification-tls_openshift-false (198.38s)
        --- PASS: kuttl/harness/opa_superset-4.1.4_opa-latest-1.16.2_openshift-false (363.58s)
        --- PASS: kuttl/harness/ldap_superset-6.1.0_ldap-authentication-no-tls_openshift-false (100.96s)
        --- PASS: kuttl/harness/cluster-operation_superset-latest-6.1.0_openshift-false (307.72s)
        --- PASS: kuttl/harness/ldap_superset-6.1.0_ldap-authentication-insecure-tls_openshift-false (105.75s)
        --- PASS: kuttl/harness/ldap_superset-4.1.4_ldap-authentication-server-verification-tls_openshift-false (99.34s)
        --- PASS: kuttl/harness/ldap_superset-4.1.4_ldap-authentication-no-tls_openshift-false (101.32s)
        --- PASS: kuttl/harness/ldap_superset-4.1.4_ldap-authentication-insecure-tls_openshift-false (103.12s)
        --- PASS: kuttl/harness/external-access_superset-6.1.0_openshift-false (88.88s)
        --- PASS: kuttl/harness/logging_superset-6.1.0_openshift-false (117.83s)
        --- PASS: kuttl/harness/external-access_superset-4.1.4_openshift-false (78.85s)
        --- PASS: kuttl/harness/druid-connection_superset-4.1.4_openshift-false (70.07s)
        --- PASS: kuttl/harness/logging_superset-4.1.4_openshift-false (101.88s)
        --- PASS: kuttl/harness/smoke_superset-6.1.0_openshift-false (97.56s)
        --- PASS: kuttl/harness/oidc_superset-4.1.4_openshift-false (123.71s)
        --- PASS: kuttl/harness/resources_superset-latest-6.1.0_openshift-false (71.33s)
        --- PASS: kuttl/harness/smoke_superset-4.1.4_openshift-false (106.62s)
        --- PASS: kuttl/harness/oidc_superset-6.1.0_openshift-false (139.25s)
        --- PASS: kuttl/harness/celery-worker_superset-6.1.0_openshift-false (147.11s)
        --- PASS: kuttl/harness/upgrade_superset-old-4.1.4_superset-new-6.1.0_authentication-oidc_openshift-false (208.44s)
        --- PASS: kuttl/harness/upgrade_superset-old-4.1.4_superset-new-6.1.0_authentication-none_openshift-false (121.92s)
        --- PASS: kuttl/harness/druid-connection_superset-6.1.0_openshift-false (69.48s)
        --- PASS: kuttl/harness/opa_superset-6.1.0_opa-latest-1.16.2_openshift-false (293.18s)
        --- PASS: kuttl/harness/celery-worker_superset-4.1.4_openshift-false (129.96s)
PASS

Unittests

test result: ok. 49 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s

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

[sbernauer]

LGTM otherwise, thanks!