Updating BuildTools, CoreCLR to preview4-03828-01, preview4-27528-71, respectively (#23536)
Updating BuildTools, CoreCLR to preview4-03828-01, preview4-27528-71, respectively (#23536)

* Removing FeedTasksPackageVersion from dependencies.props
* The corresponding metadata was removed in https://github.com/dotnet/coreclr/pull/22884

* Updating BuildTools, CoreCLR to preview4-03828-01, preview4-27528-71, respectively

* Adding a ! in String.Searching.cs

Signed-off-by: dotnet-bot <03c4cb6107ae99956a7681f2c97ff7104809a2bd@microsoft.com>

wtgodbe/corefx,shimingsg/corefx,wtgodbe/corefx,ericstj/corefx,ericstj/corefx,ViktorHofer/corefx,shimingsg/corefx,ViktorHofer/corefx,ViktorHofer/corefx,wtgodbe/corefx,shimingsg/corefx,wtgodbe/corefx,ericstj/corefx,shimingsg/corefx,BrennanConroy/corefx,ericstj/corefx,shimingsg/corefx,BrennanConroy/corefx,wtgodbe/corefx,wtgodbe/corefx,ViktorHofer/corefx,ericstj/corefx,ericstj/corefx,ericstj/corefx,BrennanConroy/corefx,ViktorHofer/corefx,ViktorHofer/corefx,ViktorHofer/corefx,wtgodbe/corefx,shimingsg/corefx,shimingsg/corefx