[tmpnet] Remove node restart from Network.CreateSubnets #4664
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Why this should be merged
tmpnet used to have working support for creating subnets after network bootstrap. Subsequently, that code path has degraded due to subnet creation only being performed as part of bootstrap to both speed up suite setup and avoid disruptive node restart during test execution.
Rather than maintain the unused ability to create subnets post-bootstrap, Network.CreateSubnets is updated to return the set of nodes affected by subnet creation (so they can be restarted if they are already running) rather than taking any responsibility for node restart.
How this was tested
CI
Need to be documented in RELEASES.md?
N/A