Add singularity.resourceLimits config option

[bentsherman]

Close #6797

This PR adds the ability to enforce resource limits on Singularity/Apptainer containers when using the local executor

When singularity.resourceLimits = true, Singularity containers are launched with --cpus and --memory, which prevents them from exceeding their allocated resources. Similar to what Docker does automatically

This feature needs to be opt-in because it requires cgroups in the host environment. Enabling it automatically could break existing code

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[christopher-hakkaart]

Docs look good

[pditommaso]

Naming suggestion: this adds resourceLimits (covering both --cpus and --memory), while Docker uses docker.cpuLimits for essentially the same feature. Since docker.cpuLimits was only just added in #7289 (2026-07-13) and has not shipped in a stable release yet, it should be safe to rename it to docker.resourceLimits here so the option name is unified across all container engines. resourceLimits is also the more accurate name since it now governs memory too.