fix: avoid recreating log FIFO after EOF [tcl-9220]

[sagrawal-byte]

Summary

• cherry-pick SlinkyProject/slurm-operator@4abbf53
• preserve an existing log FIFO and reopen it after writer EOF, preventing Slurm daemons from blocking on an unlinked FIFO inode during reconfigure

Test plan

• sh -n internal/builder/scripts/logfile.sh
• make test — existing module-path mismatch on main: cmd/manager and cmd/webhook import github.com/SlinkyProject/slurm-operator/... while go.mod declares github.com/togethercomputer/slurm-operator; remaining packages pass

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