Taskscaler and fleeting now use logrus logger

What does this MR do?

Taskscaler, fleeting and fleeting plugins use hclog.

This adds an adapter, with an implementation of hclog.Logger interface that uses logrus, so that Runner log output is consistent across subsystems.

Why was this MR needed?

To ensure log output is consistent.

What's the best way to test this MR?

Start Runner with either instance or docker-autoscaler executors. Log output will now be consistent.

• Try with --debug to also enable debug logs of taskscaler/fleeting logs.
• Try with --log-format=json to enable json log output.

What are the relevant issue numbers?

Closes #37489 (closed)