Race condition when loading multiple isolated component_container

[tonynajjar]

Generated by Generative AI

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Operating System:

```Ubuntu 26``

ROS version or commit hash:

rolling

RMW implementation (if applicable):

No response

RMW Configuration (if applicable):

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Client library (if applicable):

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'ros2 doctor --report' output

ros2 doctor --report

<COPY OUTPUT HERE>

Steps to reproduce issue

See #3134 (comment)

Expected behavior

Multiple isolated component containers load simultaneously with LoadComposableNodes under heavy CPU load at bringup with no race conditions

Actual behavior

Race condition causing some isolated component containers to not be able to load nodes reliably

Additional information

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