[e2e, scripts] Start K8s e2e from helmfile

[busma13]

This PR makes the following changes:

• creates a helm directory in e2e with the following:
  • helmfile.yaml
  • values.yaml
  • modified elastic/elasticsearch-6.8.9 chart
  • modified elastic/elasticsearch-7.9.3 chart
  • modified confluentinc/cp-helm-charts-0.6.1 chart (kafka and zookeeper)
  • go templates for teraslice and services
• update the teraslice helm chart to include the autoload_directory
• update ts-scripts test to start k8s e2e tests via helmfile using the -use-helmfile` flag
• update e2e to use helmfile commands instead of the k8s api when started via helm
• update default service versions for tests
  • kafka version from 3.5 to 3.7, which is cp-kafka:v7.7.2
  • opensearch1 from 1.3.10 to 1.3.11
  • opensearch2 from 2.8.0 to 2.15.0
• k8s e2e tests now run on opensearch2, not elasticsearch7
• update mappings between kafka and cp-kafka versions
• bump e2e version from 0.7.1 to 0.8.0
• bump scripts version from 1.9.3 to 1.10.0

ref: #3931, #3906

[sotojn]

I see that the k8sV2 tests run opensearch2 but the regular k8se2e still runs elasticsearch7. Is this intentional or are we supposed to run both with opensearch2?

[godber]

Discussed over zoom:

• For now lets keep the e2e K8s v1 tests, leave them as is, they are not worth updating, I think we are close to getting rid of them.

[sotojn]

Looks good