Major Breaking Change: Data Catalog V1 API Surface Significantly Reduced

This update introduces a significant breaking change to the Data Catalog V1 API. A large portion of the API surface has been removed, impacting core functionalities related to managing metadata. Specifically, all methods for entryGroups, entries, tags, and tagTemplates have been removed, including operations like create, delete, get, list, patch, setIamPolicy, testIamPermissions, lookup, import, modifyEntryContacts, modifyEntryOverview, star, unstar, and reconcile. Additionally, many properties from key schemas such as GoogleCloudDatacatalogV1EntryGroup, GoogleCloudDatacatalogV1FieldType, GoogleCloudDatacatalogV1TagTemplate, and GoogleCloudDatacatalogV1TagTemplateField have been removed. Developers should carefully review their existing integrations and migrate to alternative solutions or newer API versions if available, as these functionalities are no longer supported in datacatalog.v1.