[TF] Remove PythonKit from build presets. (#33163)

PythonKit was removed as a Swift build dependency in 9f0e0a6.

PythonKit was instead added as a CMake dependency of tensorflow/swift-apis in
tensorflow/swift-apis#1045.

Author: dan-zheng

utils/build-presets.ini

@@ -2490,9 +2490,6 @@ stdlib-deployment-targets=macosx-x86_64
 swift-primary-variant-sdk=OSX
 swift-primary-variant-arch=x86_64
 
-pythonkit
-install-pythonkit
-
 # Do not link libz3.
 llvm-cmake-options=-DLLVM_ENABLE_Z3_SOLVER=NO
 
@@ -2552,9 +2549,6 @@ darwin-toolchain-installer-package=%(darwin_toolchain_installer_package)s
 mixin-preset=
     buildbot_linux
 
-pythonkit
-install-pythonkit
-
 # The swift-package-tests fail when run with python3.
 test-installable-package=
 
@@ -2565,9 +2559,6 @@ llvm-cmake-options=-DLLVM_ENABLE_Z3_SOLVER=NO
 mixin-preset=
     buildbot_linux,no_test
 
-pythonkit
-install-pythonkit
-
 # The swift-package-tests fail when run with python3.
 test-installable-package=