[DO NOT MERGE] Add exec_strategy as CLI flags to all rewrapper commands

Bug: b/148798195
Test: The same change is live in master-build-rbe-testing branch where
its not causing any behavior change, and also it works for
RemoteExecution where RBE_CXX_EXEC_STRATEGY variable is set.

Bug: b/166182389
Change-Id: I5efb1c2ab74dbe70dd70bf43d6262f2063d4d378
Merged-In: I745ed4a91c2b070048c0b1fd0881e5f4f28d0148