[Issue] update return value for suggest qty as per stockstateprovider

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This issue is automatically created based on existing pull request: magento/magento2#30737: update return value for suggest qty as per stockstateprovider

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Its update returns suggested qty that satisfies qty increments/minQty/maxQty/minSaleQty/maxSaleQty else returns original qty that should be either int or float value as per stockstateprovider interface.

### Description (*)

There's return value should be either int or float. stock state provider returns the value as int | float. so we have to change the return parameter to int | float.

### Related Pull Requests

### Fixed Issues (if relevant)

### Manual testing scenarios (*)

1. ...
2. ...

### Questions or comments

### Contribution checklist (*)
- [x] Pull request has a meaningful description of its purpose
- [x] All commits are accompanied by meaningful commit messages
- [ ] All new or changed code is covered with unit/integration tests (if applicable)
- [ ] All automated tests passed successfully (all builds are green)

Review the existing pull request magento/magento2#30737 and trace the stock state provider path that returns the suggested quantity. Confirm the return value accepts int or float and identify the relevant test coverage; done means the return behavior matches the stock state provider interface and tests cover it.

Written by the indexing model from the issue text.