[tmpnet] Rename NodeProcess to ProcessRuntime

[maru-ava]

PR Chain: tmpnet+kube

This PR chain enables tmpnet to deploy temporary networks to Kubernetes. Early PRs refactor tmpnet to support the addition in #3615 of a new tmpnet node runtime for kube.

• [tmpnet] s/Network.ChainConfigs/Network.PrimaryChainConfigs/ #3854
• [tmpnet] Provide genesis, subnet and chain config via content flags #3857
• [tmpnet] Ensure Node has a reference to Network #3870
• [tmpnet] Switch back to using maps for subnet config #3877
• [tmpnet] Refactor runtime configuration in preparation for kube #3867
• [tmpnet] Unify start network flag usage between e2e and tmpnetctl #3871
• [tmpnet] Avoid serializing the node data directory #3881
• >>>>>> [tmpnet] Rename NodeProcess to ProcessRuntime #3890 <<<<<<
• [tmpnet] Switch FlagsMap from map[string]any to map[string]string #3884
• [tmpnet] Ensure tmpnet methods always have a logger #3893
• [tmpnet] Ensure all node runtime methods accept a context #3894
• [tmpnet] Move WaitForHealthy from a function to a tmpnet.Node method #3896
• [tmpnet] Delegate writing of the flag file to the runtime #3897
• [tmpnet] Move monitoring label handling to node #3898
• [tmpnet] Enable runtime-specific restart behavior #3882
• [tmpnet] Enable deployment to kube #3615
• [tmpnet] Enable monitoring of local kind cluster #3794

Why this should be merged

This is intended to be consistent with the addition of KubeRuntime and the name of the runtime configuration (ProcessRuntimeConfig).

How this was tested

CI

Need to be documented in RELEASES.md?

N/A

TODO

• Merge [tmpnet] Avoid serializing the node data directory #3881