feat: Default to not changing autoscaling schedule values at the scheduled time

[tomellis91]

Description

Currently when you don't set a value of desired_capacity, min_size or max_size it replaces them with 0 which end's up being an invalid parameter combination.

For example

Config block

"Scale Out" = {
  desired_size = 7
  min_size     = 7
 ...
}

Payload result

"requestParameters": {
  "autoScalingGroupName": "xyz"
  "scheduledActionName": "Scale Out",
  "minSize": 7,
  "maxSize": 0,
  "desiredCapacity": 7,
 },

The docs for the aws_autoscaling_schedule options desired_capacity, max_size and min_size explain Set to -1 if you don't want to change the ... at the scheduled time. Defaults to 0.

When a value is excluded from the Terraform config it's values shouldn't be overriden and updated to 0 it should leave them as is.

Motivation and Context

Invalid parameters going through and potentially scaling some configurations to 0.

Breaking Changes

Yes, it just overrides the defaults.

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

I haven't uploaded and example, it is pretty straightforward. I can if it is required but this is just a quick change.

• I have executed pre-commit run -a on my pull request

[tomellis91]

Hey @bryantbiggs, would you he able to assign a reviewer to this if possible?

Cheers

[antonbabenko]

This PR is included in version 20.35.0 🎉