Tags refactor

[tomchop]

This PR tackles #1165. Essentially:

• Removing the Tag Graph
• Replacing it with tags embedded in the object
• Changin the structure of the .tags attribute to be a list instead of a dict.

• Deprecate the Tag Graph
• Replace with embedded tags
• Fix everything that's broken
• Test UI
• Remove old indexes / collections (tentative, might be worth keeping for a migration or two)
• Migration scripts
• Add tag indexes
• Test migration script on a live DB

BREAKING CHANGES

• Object tags are now lists instead of dicts

[Copilot]

Pull Request Overview

This PR refactors the tagging system by deprecating the Tag Graph and replacing it with embedded tags in objects. Key changes include updating tests to work with dictionary‐based tag structures, refactoring tag-related methods in the core schemas and API endpoints, and removing obsolete graph queries.

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/schemas/tag.py	Updated tests use new embedded tag format and adjust expiration assertions.
tests/schemas/package.py	Modified tests to iterate over dictionary values for tags.
tests/schemas/entity.py	Removed tests related to the deprecated tag graph.
tests/helpers.py	Added a sleep delay to assist with eventual consistency in tests.
tests/core_tests/tasks.py	Changed set assertions to count assertions for tag operations.
tests/apiv2/*	Updated tag handling logic to use the new embedded tag representations.
plugins/analytics/public/expire_tags.py	Refactored expiration logic to use the new embedded tag system.
core/web/apiv2/*	Removed obsolete graph query parameters and updated tag extraction logic.
core/schemas/tag.py	Removed an in-place normalize function in favor of the one defined in model.py.
core/schemas/model.py	Introduced YetiTagInstance and refactored tag methods to use embedded tags.
core/schemas/graph.py	Removed the TagRelationship definition and related logic.
core/database_arango.py	Removed tagging methods that relied on graph queries.

[udgover]

Nice PR! potential typo + left some comments and questions about tag function implementation.

[udgover]

Let's go!