[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]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccAutoScalingGroup_warmPool\|TestAccAutoScalingGroup_basic' PKG=autoscaling ACCTEST_PARALLELISM=3
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/autoscaling/... -v -count 1 -parallel 3  -run=TestAccAutoScalingGroup_warmPool\|TestAccAutoScalingGroup_basic -timeout 360m
=== RUN   TestAccAutoScalingGroup_basic
=== PAUSE TestAccAutoScalingGroup_basic
=== RUN   TestAccAutoScalingGroup_warmPool
=== PAUSE TestAccAutoScalingGroup_warmPool
=== CONT  TestAccAutoScalingGroup_basic
=== CONT  TestAccAutoScalingGroup_warmPool
--- PASS: TestAccAutoScalingGroup_basic (55.63s)
--- PASS: TestAccAutoScalingGroup_warmPool (547.52s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/autoscaling	552.146s

[github-actions]

This functionality has been released in v5.55.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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