Avoid duplicated name for service and publisher

[Sushant-Chavan]

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Basic Info

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Ticket(s) this addresses	-
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Does this PR contain AI generated software?	No
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Description of contribution in a few bullet points

Changed the name of the recently introduce is_active publisher in the LifecycleManager to managed_nodes_activated. This allows independent remapping of the topic and service names.

Description of documentation updates required from your changes

N/A

Description of how this change was tested

N/A

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Future work that may be required in bullet points

N/A

For Maintainers:

• Check that any new parameters added are updated in docs.nav2.org
• Check that any significant change is added to the migration guide
• Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• Check that any new functions have Doxygen added
• Check that any new features have test coverage
• Check that any new plugins is added to the plugins page
• If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists
• Should this be backported to current distributions? If so, tag with backport-*.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
nav2_lifecycle_manager/src/lifecycle_manager.cpp	90.10% <100.00%> (-1.07%)	⬇️

... and 9 files with indirect coverage changes

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