[5.3][preset] Add missing libicu dependencies to package presets (swiftlang#32316)

We were accidentally using the system libicu instead of building it,
causing version mismatches.

This will unblock Linux PR testing for
swiftlang/swift-llbuild#674

(cherry picked from commit ccb41f0,
 swiftlang#31733)

Co-authored-by: Ben Langmuir <[email protected]>

Author: edymtt

utils/build-presets.ini

@@ -1579,13 +1579,16 @@ mixin-preset=
     mixin_linux_install_components_with_clang
 
 libdispatch
+libicu
 foundation
 xctest
 
+install-libicu
 install-foundation
 install-libdispatch
 install-xctest
 
+skip-test-libicu
 skip-test-foundation
 skip-test-libdispatch
 skip-test-xctest