Fix SELinux option in node pools

[mysticaltech]

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Related to #1370

Update the disable_selinux option to correctly disable SELinux on node pools.

• Change the selinux option to disable_selinux in agents.tf, autoscaler-agents.tf, control_planes.tf, init.tf, locals.tf, and variables.tf.
• Update the local.k3s-agent-config variable in agents.tf to use the disable_selinux option.
• Update the data.cloudinit_config.autoscaler_config variable in autoscaler-agents.tf to use the disable_selinux option.
• Update the local.k3s-config variable in control_planes.tf to use the disable_selinux option.
• Update the null_resource.first_control_plane resource in init.tf to use the disable_selinux option.
• Update the local.control_plane_nodes, local.agent_nodes_from_integer_counts, and local.agent_nodes_from_maps_for_counts variables in locals.tf to use the disable_selinux option.
• Update the control_plane_nodepools and agent_nodepools variables in variables.tf to use the disable_selinux option.

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For more details, open the Copilot Workspace session.