Change python tests to use specific imports to improve build / test times.

    - Leaves layers/ untouched.

PiperOrigin-RevId: 472862069

Author: srvasude

tensorflow_probability/python/bijectors/BUILD

@@ -1059,12 +1059,27 @@ multi_substrate_py_test(
     srcs = ["bijector_test.py"],
     numpy_tags = ["notap"],
     deps = [
-        ":bijectors",
+        ":bijector",
+        ":exp",
+        ":invert",
+        ":joint_map",
+        ":matrix_inverse_tril",
+        ":power",
+        ":reshape",
+        ":restructure",
+        ":scale",
+        ":scale_matvec_diag",
+        ":shift",
+        ":sigmoid",
+        ":sinh_arcsinh",
+        ":softmax_centered",
+        ":softplus",
+        ":split",
         # mock dep,
         # numpy dep,
         # tensorflow dep,
-        "//tensorflow_probability",
-        "//tensorflow_probability/python/distributions",
+        "//tensorflow_probability/python/distributions:distribution",
+        "//tensorflow_probability/python/distributions:transformed_distribution",
         "//tensorflow_probability/python/internal:cache_util",
         "//tensorflow_probability/python/internal:parameter_properties",
         "//tensorflow_probability/python/internal:tensor_util",