feat: allow floats for CPU cloud-spec values

[k15r]

Description

Changes proposed in this pull request (what was done and why):

• allow floats for values in cloud-specs to allow mapping other resource types with finer granularity.

NOTE: this change requires a schema change of edp

Changes refer to particular issues, PRs or documents:

Traceability

• The PR is linked to a GitHub issue.
• The follow-up issues (if any) are linked in the Related Issues section.
• If the change is user-facing, the documentation has been adjusted.
• If a CRD is changed, the corresponding Busola ConfigMap has been adjusted.
• The feature is unit-tested.
• The feature is e2e-tested.

[k15r]

events retrieved from edp with all machines configured to report 2.8 cpus

{
  "runtime_id": "6303fea0-19da-4957-8385-574d972e53ae",
  "sub_account_id": "fed03c96-b09a-4d5e-a586-87567912ee08",
  "shoot_name": "c-846aced",
  "timestamp": "2025-02-20T08:21:13Z",
  "compute": {
    "vm_types": [
      {
        "name": "n2-standard-2",
        "count": 7
      }
    ],
    "provisioned_cpus": 19.6,
    "provisioned_ram_gb": 56,
    "provisioned_volumes": {
      "size_gb_total": 72,
      "count": 4,
      "size_gb_rounded": 128
    }
  }
}