build: adjust shard counts for tests

These are long-running tests that could be sharded more, with the
exception of pkg/storage/metamorphic which doesn't need to be
sharded this much.

Release note: none
Epic: none

Author: rickystewart

pkg/ccl/crosscluster/physical/BUILD.bazel

@@ -121,7 +121,7 @@ go_test(
         "//build/toolchains:is_heavy": {"test.Pool": "heavy"},
         "//conditions:default": {"test.Pool": "large"},
     }),
-    shard_count = 16,
+    shard_count = 32,
     deps = [
         "//pkg/base",
         "//pkg/ccl",

pkg/ccl/multiregionccl/BUILD.bazel

@@ -44,7 +44,7 @@ go_test(
         "//build/toolchains:is_heavy": {"test.Pool": "heavy"},
         "//conditions:default": {"test.Pool": "large"},
     }),
-    shard_count = 16,
+    shard_count = 24,
     deps = [
         "//pkg/base",
         "//pkg/ccl",

pkg/sql/schemachanger/BUILD.bazel

@@ -36,7 +36,7 @@ go_test(
         "//build/toolchains:is_heavy": {"test.Pool": "heavy"},
         "//conditions:default": {"test.Pool": "large"},
     }),
-    shard_count = 32,
+    shard_count = 48,
     deps = [
         "//pkg/base",
         "//pkg/jobs",

pkg/sql/stmtdiagnostics/BUILD.bazel

@@ -32,6 +32,7 @@ go_test(
         "statement_diagnostics_test.go",
     ],
     embed = [":stmtdiagnostics"],
+    shard_count = 4,
     tags = ["no-remote-exec"],
     deps = [
         "//pkg/base",

pkg/storage/metamorphic/BUILD.bazel

@@ -45,7 +45,6 @@ go_test(
     data = glob(["testdata/**"]),
     embed = [":metamorphic"],
     exec_properties = {"test.Pool": "large"},
-    shard_count = 8,
     deps = [
         "//pkg/settings/cluster",
         "//pkg/testutils",