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Add integration tests for updates over LDP destinations

These tests run the engine against an in-memory HTTP server that mimics
the update-related behaviour of the Community Solid Server, and cover the
scenarios of https://github.com/comunica/comunica-feature-solid/issues/43:

* a new resource is created with a PUT request;
* an existing resource is updated with a SPARQL Update PATCH request,
  so that data that is already present is not removed;
* deletions on an existing resource use a PATCH request as well.

They also cover reading a resource that was just written. Reading a
resource that was created by the same engine currently fails, because the
engine dereferences the destination before it exists, and keeps the
resulting 404 in its source cache. That scenario is included as a failing
test, together with the invalidateHttpCache workaround.

Integration tests are not part of `yarn test`, as they start HTTP servers.
They are run via `yarn run test-integration`, in a separate CI job.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ga4koWj2GzJyJp8w6ZVPF8

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