test: run the live tests that no longer need to be skipped

[JosteinGj]

Summary

Fewer skipped tests. What stays skipped is what is genuinely expensive or needs special setup: the multi-million-point datapoint tests, the ingest benchmark, and the multi-tenant/auth tests that need extra Keycloak principals.

Rust

• 13 live tests were #[ignore]d only because they call a backend, unlike the rest of the suite. They pass and now run by default: labels (2), functions (2), assets (3), label_update_tests (3), update_echo_is_typed_per_node_type, test_insert_datapoints_binary_re_resolves_a_recreated_series, and the cleanup-guard deadlock test.
• test_delete_timeseries_bound_to_subscription_returns_400 waited on a backend fix that has since shipped. The api answers 409 referenced with the subscription in blockedBy, not 400. The test is renamed ..._is_refused, asserts that, and runs.
• vocabulary::test_search_dimensions_is_case_insensitive_substring printed SKIP on a tenant with no event types. It now seeds one.

Python

• The 5 listen tests lose their RUN_LISTEN_TESTS gate. The Rust twin already ran ungated.
• The skip for a backend without POST /edges/create (405) is gone.
• The event vocabulary tests seed two events with fixed types instead of skipping. The type names are fixed, not unique, because a type stays in the vocabulary after its events are deleted.
• test_every_type_label_is_matchable creates one node of each type, policy included, instead of skipping types the tenant happens to lack.
• The test_units setup asserts the unit catalogue the api's migrations create instead of skipping when it's empty.

No SDK surface changes, so no docs pages are affected.

Test plan

• Every test this PR stops skipping, run against a local backend: all pass
• Full Python suite: 656 passed, 1 failed, 3 skipped
• Full Rust suite: 292 passed, 2 failed
• The file-lifecycle failure (Rust and Python) is not from this PR: the current api no longer renames a deleted file's external id. fix(files)!: follow the api's verbatim file external ids and deletedAt trash #164 fixes it.
• test_subscription_listen_end_to_end failed once under the full parallel run and passed alone. It was not ignored before either.

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