Align windows agent to linux so that service is disabled on when datadog_enabled false

[erikhjensen]

This includes several proposed modifications:

• Reorder the services in the stop_services task so that when they are shut down, they don't have dependency issues due to shutdown order of operations
• Disable services rather than stopping them when datadog_enabled is false
• Ensure services are not set to disabled when datadog_enabled is true
• Resolve/compute datadog_tracked_checks within the task sequence as set_fact rather than only with the default vars so that its variable precedence is higher than include_vars. Also address null/none dictionary during this step. Propose calling it sanitize-checks.

[KSerrania]

Hi @erikhjensen,

Thanks for the PR! I left a few nits, but overall this looks good to me. I tested your changes on Windows and Linux and they're working fine.

[erikhjensen]

Hi @KSerrania I did not perform a reverse pull request to update my fork w/ the nits. From your comments about testing I am either assuming the updates are innately benign or, that you did test them. Is there further action for me?

[KSerrania]

Hey @erikhjensen, I think these updates are fine. I'll do one last round of testing tomorrow to double-check everything and then approve & merge the PR.

[KSerrania]

LGTM, I'll merge once the linting error is fixed.