Drop back-deploy-concurrency and install-back-deploy-concurrency from presets

Author: shahmishal

utils/build-presets.ini

@@ -38,13 +38,9 @@ build-swift-stdlib-unittest-extra
 
 install-llvm
 install-swift
-install-back-deploy-concurrency
 
 skip-test-cmark
 
-# Build concurrency back-deployment binaries
-back-deploy-concurrency
-
 # Path to the root of the installation filesystem.
 install-destdir=%(install_destdir)s
 
@@ -1672,9 +1668,6 @@ mixin-preset=
     mixin_swiftpm_base
     mixin_buildbot_install_components_with_clang
 
-back-deploy-concurrency
-install-back-deploy-concurrency
-
 [preset: mixin_swiftpm_linux_platform]
 mixin-preset=
     mixin_swiftpm_base
@@ -2642,8 +2635,6 @@ build-subdir=compat_macos
 ios
 tvos
 watchos
-back-deploy-concurrency
-install-back-deploy-concurrency
 compiler-vendor=apple
 darwin-install-extract-symbols
 darwin-toolchain-alias=swift