Changes

[llvm-objcopy] Consolidate and unify version tests

In this diff the tests which verify version printing functionality are refactored.
Since they are not specific to a particular format we move them into tool-version.test
and slightly unify (similarly to tool-name.test and tool-help-message.test).

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D87211