feat(vault_kubernetes_auth_backend_role): support for bound_service_account_namespace_selector field

[fredouric]

Description

Permits to use namespace selectors for allowing kubernetes namespaces to access roles.
The bound_service_account_namespace_selector field was implemented in Vault v1.16

Closes #1882

Checklist

• Added CHANGELOG entry (only for user-facing changes)
• Acceptance tests where run against all supported Vault Versions

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccKubernetesAuthBackendRole -v'

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -run=TestAccKubernetesAuthBackendRole -v -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/codegen   (cached) [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  (cached) [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/sync     [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/internal/provider (cached) [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/testutil  (cached) [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/util      (cached) [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/util/mountutil    (cached) [no tests to run]
=== RUN   TestAccKubernetesAuthBackendRoleDataSource_basic
--- PASS: TestAccKubernetesAuthBackendRoleDataSource_basic (0.65s)
=== RUN   TestAccKubernetesAuthBackendRoleDataSource_full
--- PASS: TestAccKubernetesAuthBackendRoleDataSource_full (0.51s)
=== RUN   TestAccKubernetesAuthBackendRole_import
--- PASS: TestAccKubernetesAuthBackendRole_import (0.63s)
=== RUN   TestAccKubernetesAuthBackendRole_basic
--- PASS: TestAccKubernetesAuthBackendRole_basic (0.49s)
=== RUN   TestAccKubernetesAuthBackendRole_update
--- PASS: TestAccKubernetesAuthBackendRole_update (0.88s)
=== RUN   TestAccKubernetesAuthBackendRole_full
--- PASS: TestAccKubernetesAuthBackendRole_full (0.50s)
=== RUN   TestAccKubernetesAuthBackendRole_fullUpdate
--- PASS: TestAccKubernetesAuthBackendRole_fullUpdate (1.98s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/vault     (cached)

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