fix: Remove volume type variable, handle invalid index error

[erezrokah]

Running terraform plan on the non tls examples gives the multiple 'iops' must not be set when 'type' is 'gp2' errors.
Setting:

 clickhouse_volume_type   = "gp3"
 keeper_volume_type      = "gp3"

solves that error only to get Error: Invalid index errors.

This PR fixes the issues by removing the volume type configurations and checking if encryption is enabled before accessing some arrays.

I think we should also run terraform plan in CI (see commented out code), but we need to set up a role for it. How do we usually do that? I don't want to manually create it

[github-actions]

KICS version: v1.7.13

Category Results HIGH 0 MEDIUM 9 LOW 13 INFO 8 TRACE 0 TOTAL 30	Metric Values Files scanned 20 Files parsed 20 Files failed to scan 0 Total executed queries 1043 Queries failed to execute 19 Execution time 28

[rebelopsio]

Great idea regarding CI @erezrokah. I can look later this morning.