[ASG] fix: Fixed max_group_prepared_capacity to allow setting 0

[ponkio-o]

Description

Hi, I fixed a bug in ASG warm poll settings where "Warm poll size" could not be set to 0.
The API allows "MaxGroupPreparedCapacity" to be set to 0. In fact, it can be set on the management console.

Relations

Closes: #37173

References

https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_PutWarmPool.html#API_PutWarmPool_RequestParameters

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccAutoScalingGroup_warmPool' PKG=autoscaling
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/autoscaling/... -v -count 1 -parallel 20  -run=TestAccAutoScalingGroup_warmPool -timeout 360m
=== RUN   TestAccAutoScalingGroup_warmPool
=== PAUSE TestAccAutoScalingGroup_warmPool
=== CONT  TestAccAutoScalingGroup_warmPool
--- PASS: TestAccAutoScalingGroup_warmPool (495.11s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/autoscaling        500.164s
...

[github-actions]

Community Note

Voting for Prioritization

• Please vote on this pull request by adding a 👍 reaction to the original post to help the community and maintainers prioritize this pull request.
• Please see our prioritization guide for information on how we prioritize.
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for issue followers and do not help prioritize the request.

For Submitters

• Review the contribution guide relating to the type of change you are making to ensure all of the necessary steps have been taken.
• For new resources and data sources, use skaff to generate scaffolding with comments detailing common expectations.
• Whether or not the branch has been rebased will not impact prioritization, but doing so is always a welcome surprise.