Feat: provide safety net for block updates by walking up the entry chain

[nondescriptpointer]

Walk up the entry ownership chain to always purge the root entry.

Handles following cases:

• Block updates without saves to the parent
• Parent save is skipped due to isDraftOrRevision or resaving guards
• New blocks that are added

[Copilot]

Pull request overview

Adds a “safety net” purge behavior intended to ensure cache tags for the root owning entry are purged when nested content changes don’t result in a parent save, by walking up an ownership chain.

Changes:

• Walk up an element ownership chain and enqueue purge tags for the root owner’s section and element ID.
• Add a max-depth guard to prevent infinite traversal.

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[arontseggai]

@nondescriptpointer ik heb copilot de review laten doen.

Kan je de uitkomst verwerken?

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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[arontseggai]

Tested on staging.

Purging still works and works on the scenario's written on the ticket.

I will merge this.