[ONPREM-1829] [HACKWEEK] Add initial support for Windows containers

[christian-stephen]

⚙️ Issue

https://circleci.atlassian.net/browse/ONPREM-1829

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⚙️ Change Description

This PR adds support for Windows on container runner. The only updates were made to GOAT and the runner-init image. Some changes to the process and signal handling in GOAT needed to be made since it was Linux-centric. In addition, the binary and images needed to be updated in order to target Windows. The base image for runner-init needed to also be based on a Windows image, since a container OS is required for Windows, which have been added to the manifest.

Example job using a Windows container: https://app.circleci.com/pipelines/github/circleci/runner-dummy/3006/workflows/ccc16261-2422-41a3-8a99-bbd06ad7c6e7/jobs/193687?invite=true#step-102-42_67

The only known limitation of Windows containers is that service containers are currently unsupported. This will be addressed in a followup ticket (ONPREM-1830), which will require targeting Windows for the logging-collector binary and image.

Acceptance Criteria:

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✅ Solution

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❓ Testing

• Created and updated tests where applicable
  • All existing unit tests (other than the golden tests) are now running against Windows in CI: https://app.circleci.com/pipelines/github/circleci/runner-init/2184/workflows/8b433aa9-3b04-4db3-b1ed-417b779f0d2f/jobs/5061
  • Smoke tests will added in a followup ticket (ONPREM-1831)

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📖 Documentation Updates

• Updated related documentation, if applicable
  • External docs will be updated in ticket ONPREM-1832
• Updated changelog