Feature/waf onboard custom rule group

[Manuelvaas]

Description

relates to STACKITTPR-748

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• Acceptance tests got implemented or updated (see e.g. here)
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[SerseusWasTaken]

look pretty clean, but found an issue during testing:
Using this config:

resource "stackit_alb_waf_custom_rule_group" "custom_rule_group" {
  project_id = local.project_id
  name       = "some-name"
  rules = [
    {
      behavior = {
        action = "ACTION_DENY"
        log    = true
      }
      conditions = [
        {
          operator = {
            type  = "OPERATOR_VALIDATE_UTF8_ENCODING"
            value = "dummy"
          }
          variable = {
            type = "VARIABLE_RESPONSE_STATUS"
          }
        }
      ]
    }
  ]
}

terraform apply runs successfully, but after changing rules[0].behavior.log to false, i got this error:

│ Error: Provider produced inconsistent result after apply
│ 
│ When applying changes to stackit_alb_waf_custom_rule_group.custom_rule_group, provider "provider[\"registry.terraform.io/stackitcloud/stackit\"]" produced an unexpected new value: .rules[0].behavior.log: was cty.False, but now null.
│ 
│ This is a bug in the provider, which should be reported in the provider's own issue tracker.

[github-actions]

Merging this branch changes the coverage (1 decrease, 1 increase)

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/terraform-provider-stackit/stackit	1.17% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf	0.00% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/custom_rule_group	32.43% (+32.43%)	🌟
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/managed_rule_set	8.37% (-0.59%)	👎

---

Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/custom_rule_group/datasource.go	0.00% (ø)	46 (+46)	0	46 (+46)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/custom_rule_group/resource.go	38.40% (+38.40%)	250 (+250)	96 (+96)	154 (+154)	🌟
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/managed_rule_set/datasource.go	0.00% (ø)	46	0	46
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/managed_rule_set/resource.go	10.83% (-0.62%)	157 (-9)	17 (-2)	140 (-7)	👎
github.com/stackitcloud/terraform-provider-stackit/stackit/provider.go	1.17% (ø)	171	2	169

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/albwaf_acc_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/custom_rule_group/resource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/albwaf/managed_rule_set/resource_test.go

[SerseusWasTaken]

should probably use getRegionWithOverride function like the create function does