vecindex: delete old fixup code

Now that both vecstore and memstore have been converted to use the new
non-transactional fixups, there is no need to keep around the old fixup
code. This commit deletes all that code in the fixup worker and stores.

Epic: CRDB-42943
Release note: None

Author: andy-kimball

pkg/cmd/vecbench/main.go

@@ -439,7 +439,6 @@ func newVectorProvider(
 		MinPartitionSize: minPartitionSize,
 		MaxPartitionSize: maxPartitionSize,
 		BaseBeamSize:     *flagBeamSize,
-		UseNewFixups:     true,
 	}
 
 	if *flagMemStore {

pkg/sql/vecindex/cspann/BUILD.bazel

@@ -24,7 +24,6 @@ go_library(
         "partition_metadata.go",
         "search_set.go",
         "searcher.go",
-        "split_data.go",
         "store.go",
         "store_errors.go",
     ],
@@ -55,7 +54,6 @@ go_test(
         "cspannpb_test.go",
         "fixup_processor_test.go",
         "fixup_split_test.go",
-        "fixup_worker_test.go",
         "index_stats_test.go",
         "index_test.go",
         "kmeans_test.go",

pkg/sql/vecindex/cspann/commontest/BUILD.bazel

@@ -12,7 +12,6 @@ go_library(
         "//pkg/sql/vecindex/cspann",
         "//pkg/sql/vecindex/cspann/quantize",
         "//pkg/sql/vecindex/cspann/testutils",
-        "//pkg/sql/vecindex/cspann/workspace",
         "//pkg/util/vector",
         "@com_github_cockroachdb_errors//:errors",
         "@com_github_stretchr_testify//require",