Update 'images list' cmd to use config variables, not hardcoded values

[busma13]

This PR makes the following changes:

• Add several new variables to config.ts:
  • KIND_DOCKER_IMAGE
  • KIND_VERSION
  • BASE_DOCKER_IMAGE
  • TEST_NODE_VERSIONS
  • DEFAULT_NODE_VERSION
  • __DEFAULT_ELASTICSEARCH6_VERSION
  • __DEFAULT_ELASTICSEARCH7_VERSION
  • __DEFAULT_OPENSEARCH1_VERSION
  • __DEFAULT_OPENSEARCH2_VERSION
• images list command creates the image tags and versions based off the values in config.ts instead of hard-coded values.
• Replace other hard-coded values where necessary
• Remove version flags from test-runner and k8s-env commands and get all versions from config.ts