This pull request adds functionality to the e2e runner process to start and stop tendermint nodes on non-local machines.

To achieve this goal, it makes the following set of changes:

• Adds a set of methods for starting and stopping Tendermint to the infra.Provider interface and implements them by both the docker.Provider and digitalocean.Provider. The digitalocean provider expects Tendermint to be running under systemd and is started/stopped/killed using interactions with systemd.
• Adds a set of ssh functionality to the e2e test runner to allow interaction with the remove Tendermint nodes. This ssh functionality expects an ssh-agent to be running on the host machine and uses keys from the ssh-agent to connect to the remote. This allows operators of the e2e runner to either run the process locally or to run it on a remote orchestrator machine and grant it permission to ssh to additional nodes using ssh-agent forwarding.
• moves the dockerComposeExec functionality to the docker package. The remaining uses of this new docker.ComposeExec function are all targets for replacement with provider methods.
• Updates the e2e testing to pass the InfrastructureData and InfrastructureType to the test subprocess.

Closes: #9790

PR checklist

• Tests written/updated, or no tests needed
• CHANGELOG_PENDING.md updated, or no changelog entry needed
• Updated relevant documentation (docs/) and code comments, or no
  documentation updates needed