change thread operations utilities paths in XCode so that they can be debugged

Summary: When I started to work on ENG-1398 (https://linear.app/comm/issue/ENG-1398/ios-build-136-repeatedly-crashing) I wanted to add some breakpoints in ThreadOperations.cpp. However I noticed that after landind diffs that introduced MessageOperationsUtilities, this file stopped being visible from XCode. So I deleted it and add it once again. This time XCode correctly sees the file and breakpoint insertion is possible.

Test Plan: Check that we cannot see ThreadOperations.{h, cpp} in XCode on master branch, but we can see those files after patching this diff. Ensure that app compiles and we can debug those files

Reviewers: palys-swm

Reviewed By: palys-swm

Subscribers: ashoat, Adrian, atul, yayabosh

Differential Revision: https://phab.comm.dev/D4572