[Fixes #14455] XML metadata is not regenerated after updating metadata

[etj]

Fixes #14455

• Refact catalogue_post_save to extract update_csw_metadata procedure
• Call update_csw_metadata after saving metadata.

Preferred this explicit implementation instead of calling get_real_instance for triggering catalogue_post_save by signal

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[Copilot]

Pull request overview

This PR addresses GeoNode issue #14455 by ensuring CSW XML metadata is regenerated after users update resource metadata via the API. It refactors catalogue post-save behavior to centralize the XML/ANYTEXT regeneration logic and explicitly triggers that regeneration after metadata updates.

Changes:

• Extracted CSW XML/ANYTEXT regeneration into a reusable update_csw_metadata() helper.
• Updated catalogue_post_save() to use the extracted helper during normal catalogue synchronization.
• Invoked update_csw_metadata() after metadata updates in the PUT/PATCH /api/v2/metadata/instance/<pk>/ flow.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
geonode/metadata/api/views.py	Calls CSW metadata regeneration after saving updated JSON-schema metadata.
geonode/catalogue/models.py	Refactors catalogue post-save to reuse update_csw_metadata() and adjusts link recreation / logging paths.

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