Fix multiple calls to export reference interfaces (backport #1108)

[mergify]

This is an automatic backport of pull request #1108 done by Mergify.
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On branch mergify/bp/humble/pr-1108
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Changes to be committed:
	modified:   controller_manager/src/controller_manager.cpp

Unmerged paths:
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	both modified:   controller_manager/test/test_controller_manager_srvs.cpp

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[saikishor]

This should fix it