Ensure we select the right execution binary for all dexopt commands

Some devices may not have the debug version of the binaries, so even if we
are asked to use them we can't...

Unify the logic which decides what execution binary to use and apply it to
all commands (dex2oat, profman, dexoptanalyzer).

(follow up fixes to 67a14f65)

Test: installd tests
Bug: 124009579
Change-Id: Iec439c0ed63e709cdf35b7f718533eafd429b9c2