Support configuring as receptive agent

Add support for the new command line flags, environment vars, etc based on:

• https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/blob/master/doc/kas_to_agentk_connectivity.md
• gitlab-org/cluster-integration/gitlab-agent!1547 (merged)

Proposal

• Add support for new command line flags. Add new configurations under values.config for each of:
  • receptive-listen-network
  • receptive-listen-address
  • receptive-cert-file
  • receptive-key-file
  • receptive-jwt-file
  • private-api-listen-network
  • private-api-listen-address
  • private-api-cert-file
  • private-api-key-file
  • private-api-ca-cert-file
  • private-api-jwt-file
• For new env var, we can just use values.extraEnv for:
  • POD_SELECTOR_LABELS: (Maybe, we can set the default value?)
  • OWN_PRIVATE_API_URL
  • OWN_PRIVATE_API_HOST
• Add Service resource.
• Add Ingress resource.

Out of scope:

• mTLS
• CertManager, CertManager Issuer