fix : set desired_nodes without max_nodes and min_nodes

[atnbrg]

Description

When you want to create a nodepool, if you don't specify the max_nodes parameter, it is set to "0".
When you call the nodepool creation, the desired_nodes can not be greater than the max_nodes, and so it is set to "0".
The nodepool is created with 0 node.
The payload of the request must contain only the parameters specify in the hcl nodepool resource.

Fixes #485 (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A: make testacc TESTARGS="-run TestAccCloudProjectKubeNodePoolRessource"
• Test A: make testacc TESTARGS="-run TestAccCloudProjectKubeNodePool"

Test Configuration:

• Terraform version: terraform version: Terraform v1.6.6

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have added acceptance tests that prove my fix is effective or that my feature works
• New and existing acceptance tests pass locally with my changes

[atnbrg]

Can you review this pull request ?