[clang-tidy] Move formatDereference to FixitHintUtils
I'd like to use RedundantStringCStrCheck's formatDereference function from the up-coming modernize-use-std-print check. Let's move it to FixItHintUtils so that the implementation can be shared. Reviewed By: PiotrZSL Differential Revision: https://reviews.llvm.org/D150602
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