Revert "[build] Enable noncopyable generics; disable anything that prevents toolchain builds from succeeding"

This reverts commit 0266c6d.

Author: lorentey

utils/build-presets.ini

@@ -1293,10 +1293,6 @@ build-swift-stdlib-unittest-extra
 # Don't build the benchmarks
 skip-build-benchmarks
 
-# FIXME(NCG): Temporary additions for dev toolchain generation
-enable-experimental-noncopyable-generics=1
-bootstrapping=hosttools
-
 # When building for an Xcode toolchain, don't copy the Swift Resource/ directory
 # into the LLDB.framework. LLDB.framework will be installed alongside a Swift
 # compiler, so LLDB should use its resource directory directly.