Add option to use AWS instance ID as hostname

[sarah-witt]

What does this PR do?

Adds option to use AWS instance ID as hostname

Description of the Change

When enabled, the plugin will attempt to use the AWS instance ID as the hostname.

Alternate Designs

Don't add an option, and only call the method when on an AWS host

some drawbacks to this approach are:

• difficult to detect accurately and when jenkins has migrated hosts
• not backwards compatible

some benefits to this approach are:

• closer to the agent behavior
• less configuration bloat

  Possible Drawbacks

Verification Process

Additional Notes

Release Notes

Review checklist (to be filled by reviewers)

• [ ] Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• [ ] PR title must be written as a CHANGELOG entry (see why)
• [ ] Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• [ ] PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• [ ] PR should not have do-not-merge/ label attached.
• [ ] If Applicable, issue must have kind/ and severity/ labels attached at least.