feat(cluster.tf): add support for setting cgroup mode

[chicocvenancio]

Fix #1838

[chicocvenancio]

I do think it would be better to expose linux_node_config directly instead of splitting it into node_pools_linux_node_configs_sysctls and node_pools_cgroup_mode but did not want to make that big of a change without prior discussion.

[bharathkkb]

/gcbrun

[bharathkkb]

Thanks for the PR @chicocvenancio and I agree exposing linux_node_config would be ideal. I think this looks good given current API.

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[apeabody]

Thanks for the contribution @chicocvenancio!

From the CI tests:

Step #67 - "converge node-pool-local": STDERR: Error: expected node_config.0.linux_node_config.0.cgroup_mode to be one of ["CGROUP_MODE_UNSPECIFIED" "CGROUP_MODE_V1" "CGROUP_MODE_V2"], got 
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local":   with module.example.module.gke.google_container_node_pool.pools["pool-01"],
Step #67 - "converge node-pool-local":   on ../../../modules/beta-public-cluster/cluster.tf line 565, in resource "google_container_node_pool" "pools":
Step #67 - "converge node-pool-local":  565:   node_config {
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local": Error: expected node_config.0.linux_node_config.0.cgroup_mode to be one of ["CGROUP_MODE_UNSPECIFIED" "CGROUP_MODE_V1" "CGROUP_MODE_V2"], got 
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local":   with module.example.module.gke.google_container_node_pool.pools["pool-02"],
Step #67 - "converge node-pool-local":   on ../../../modules/beta-public-cluster/cluster.tf line 565, in resource "google_container_node_pool" "pools":
Step #67 - "converge node-pool-local":  565:   node_config {
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local": Error: expected node_config.0.linux_node_config.0.cgroup_mode to be one of ["CGROUP_MODE_UNSPECIFIED" "CGROUP_MODE_V1" "CGROUP_MODE_V2"], got 
Step #67 - "converge node-pool-local": 
Step #67 - "converge node-pool-local":   with module.example.module.gke.google_container_node_pool.pools["pool-03"],
Step #67 - "converge node-pool-local":   on ../../../modules/beta-public-cluster/cluster.tf line 565, in resource "google_container_node_pool" "pools":
Step #67 - "converge node-pool-local":  565:   node_config {

Can you also please rebase the PR, and we can do a fresh run of the CI tests.

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