[ci-bitrise] Drop dangling run_tests pipeline

Referenced build_for_testing/test_without_building workflows that were
never defined — copied the pipeline block from LC Wallet without its
matching workflow definitions. Unused anyway (not in trigger_map, no
PR trigger wanted), so removing instead of completing it.

bitrise.yml

@@ -31,16 +31,6 @@ app:
     #                       hardcoded team like LC Wallet, so it's injected
     #                       here instead)
 
-# ─── PIPELINES ────────────────────────────────────────────────────────────────
-pipelines:
-  run_tests:
-    workflows:
-      build_for_testing: {}
-      test_without_building:
-        depends_on:
-          - build_for_testing
-        parallel: "$TEST_SHARD_COUNT"
-
 # ─── WORKFLOWS ────────────────────────────────────────────────────────────────
 workflows: