[BD-5519] Document Cloud Data Ingestion as catalog update method

[Copilot]

The catalog creation page documented only CSV upload, browser creation, and REST API methods, omitting Cloud Data Ingestion despite CDI supporting catalog sync functionality.

Changes

• Added alert note in "Creating a catalog" section linking to CDI documentation, informing users early that catalogs can be created/maintained via data warehouse sync
• Added "Using Cloud Data Ingestion" subsection under "Managing catalogs" detailing CDI as a method to sync catalog data from Snowflake, Redshift, BigQuery, Databricks, Microsoft Fabric, or S3 on a scheduled basis

Both additions reference the existing sync_catalogs_data.md page for implementation details.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[BD-5519]:Catalogs Creation via CDI</issue_title>
<issue_description>Description: Add some information in this page explaining that a Catalog can be maintained through Cloud Data Ingestion, not exclusively API, CSV, or browser.

Evidence here: https://www.braze.com/docs/user_guide/data/unification/cloud_ingestion/sync_catalogs_data
Request Url: https://www.braze.com/docs/user_guide/data/activation/catalogs/create
JIRA: BD-5519</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [BD-5519]:Catalogs Creation via CDI #11441

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Fixes #11441