[ORC] Update ELF debugger support plugin to use AllocActions (#167866)

The `DebugObjectManagerPlugin` implements debugger support for ELF
platforms with the GDB JIT Interface. It emits a separate debug object
allocation in addition to the LinkGraph's own allocation. This used to
happen in the plugin's `notifyEmitted()` callback, i.e. after the
LinkGraph's allocation was finalized. In the meantime, it had to block
finalization of the corresponding materialization unit to make sure that
the debugger can register the object before the code runs.

This patch switches the plugin to use an allocation action instead. We
can remove the `notifyEmitted()` hook and implement all steps as JITLink
passes.

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