The asim testdata format currently specifies nodes' cpu capacity in nanoseconds/core, so large numbers with lots of zeroes. It'd be better to specify this as a float (1.5 meaning 1.5 cores, so it would be 1500000000 (1.5 * 1e9) in today's syntax. At that point, we should probably also rename the parameter from node_cpu_rate_capacity to something like node_cpu_cores.

Epic: CRDB-55052

Jira issue: CRDB-56219