feat(ldes-client): adjust tombstone handling

[elpoelma]

Overview

This PR includes some modifications in how we handle tombstone (deleted) resources in the lmb ldes-client.
Specifically this PR includes:

• A migration which removes all outgoing and incoming triples related to tombstone resources, across all graphs
• An adjustment to processPage.ts to remove incoming tombstones resources completely from our database (all related triples)

connected issues and PRs:

None

Setup

Ensure you have the ldes-client service set-up locally

How to test/reproduce

Scenario 1: starting from an empty database

• Start virtuoso + migrations from scratch
• Connect the ldes-client to your LMB environment of choice
• Start the ldes-client and let it run (to completion)
• Ensure that the triplestore does not contain any tombstone resources

Scenario 2: starting from a DEV/QA/PROD backup

• Run the migration and ensure all tombstone resources (+ connected triples) are removed
• The ldes-client should work as expected

Challenges/uncertainties

• I used UNION instead of OPTIONAL as it is more performant
• The migration needs a high ResultSetMaxRows to fully execute

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• no new deprecations