Tweak Remote class and test multi-threaded file remote access #3745

Job	Run time
git_checks	10s
format	33s
linux_el8 (el8, icc, ompi)	54m 36s
linux_el8 (el8, oneapi, ompi)	57m 5s
CodeQL (cpp)	33m 59s
macos (macos11, serial)	4m 58s
linux_ubuntu (ubuntu20.04, gcc8, shared, ompi)	35m 43s
macos (macos12, serial)	5m 2s
windows (win2019, serial)	13m 53s
linux_ubuntu (ubuntu20.04, gcc9, shared, ompi)	33m 51s
windows (win2019, ompi)	19m 43s
docker (ubuntu-bionic)	14m 3s
linux_ubuntu (ubuntu20.04, gcc10, shared, ompi)	33m 58s
windows (win2022, serial)	17m 10s
linux_ubuntu (ubuntu20.04, gcc11, shared, ompi)	33m 40s
windows (win2022, ompi)	24m 17s
linux_ubuntu (ubuntu20.04, clang6, shared, ompi)	28m 15s
linux_ubuntu (ubuntu20.04, clang10, shared, ompi)	32m 51s
linux_ubuntu (ubuntu20.04, gcc10, mpich)	59m 54s
linux_ubuntu (ubuntu20.04, gcc8, serial)	10m 33s
linux_ubuntu (ubuntu20.04, clang6, serial)	10m 21s
linux_ubuntu (ubuntu20.04, gcc8, static, ompi, build_only)	9m 46s
linux_ubuntu (ubuntu20.04, clang6, static, ompi, build_only)	9m 39s
linux_ubuntu (ubuntu20.04, gcc8, static, serial)	10m 49s
contract (examples)	2m 35s
contract (lammps)	6m 4s
contract (tau)	18m 57s
build_and_test	3s
	9h 42m 28s

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