fix: 2107: Add missing schema fields and tests for ext_key_usage_oids

[austin-laney]

Description

Relates OR Closes #2107

Checklist

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

Output from acceptance testing:

$ terraform-provider-vault % VAULT_TOKEN="TEST" VAULT_ADDR='http://127.0.0.1:8200' make testacc TESTARGS='-run=TestPkiSecretBackendRole'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -run=TestPkiSecretBackendRole -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]
ok      github.com/hashicorp/terraform-provider-vault/codegen   (cached) [no tests to run]
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]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     16.497s

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[hashicorp-cla]

All committers have signed the CLA.

[austin-laney]

Configuration including new ext_key_usage_oids attribute:

Proper configuration of role:

Added to list of extended key usage in generated certificate:

[fairclothjm]

@austin-laney Thanks for the contribution! Could you please make the requested changes?

[fairclothjm]

LGTM! Thanks @austin-laney !