Ab#82568 (#30)

* feat(client): Update client to be compatible with vcr tests

* feat(v24): add certificate cleanup fields to template models

Add CertificateCleanupEnabled, TimeAfterExpiration, TimeAfterExpirationUnits,
and DeleteWithArchivedKey to TemplatesTemplateRetrievalResponse and
TemplatesTemplateUpdateRequest. Add CSSCMSDataModelEnumsCertificateCleanupTimeUnits
enum (0=Days, 1=Weeks, 2=Months). Guard nullable field getters against nil
pointer dereference when JSON null is present.

* feat(v24/v25): add Manageability field to template retrieval response

Add NullableInt32 Manageability field with getter/setter and ToMap entry
to TemplatesTemplateRetrievalResponse in both v24 and v25 SDK packages.
Field is read-only (v25+) and was present in JSON responses but missing
from the Go struct, causing it to always deserialize as zero.

Author: spbsoluble