Add integration test for update with --require-crl-on-client-certificate

Adds test case to verify the update operation with the new flag,
as requested in review feedback.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: akhasibhatla

test/fixtures/output/iam/certificate-authority/update-require-crl.golden

@@ -0,0 +1,11 @@
++--------------------------------+------------------------------------------+
+| ID                             | op-12345                                 |
+| Name                           | my-ca                                    |
+| Description                    | my certificate authority                 |
+| Fingerprints                   | B1BC968BD4f49D622AA89A81F2150152A41D829C |
+| Expiration Dates               | 2017-07-21 17:32:28 +0000 UTC            |
+| Serial Numbers                 | 219C542DE8f6EC7177FA4EE8C3705797         |
+| Certificate Chain Filename     | certificate.pem                          |
+| Require CRL On Client          | false                                    |
+| Certificate                    |                                          |
++--------------------------------+------------------------------------------+

test/iam_test.go

@@ -326,6 +326,7 @@ func (s *CLITestSuite) TestIamCertificateAuthority() {
 		{args: "iam certificate-authority describe op-12345 -o json", fixture: "iam/certificate-authority/describe-json.golden"},
 		{args: `iam certificate-authority update op-12345 --name "new name" --description "new description" --certificate-chain ABC123 --certificate-chain-filename certificate-2.pem`, fixture: "iam/certificate-authority/update.golden"},
 		{args: `iam certificate-authority update op-12345 --name "new name" --description "new description" --certificate-chain ABC123 --certificate-chain-filename certificate-2.pem --crl-url example.url`, fixture: "iam/certificate-authority/update-crl-url.golden"},
+		{args: "iam certificate-authority update op-12345 --require-crl-on-client-certificate=false", fixture: "iam/certificate-authority/update-require-crl.golden"},
 		{args: `iam certificate-authority update op-12345 --name "new name" --description "new description" --certificate-chain-filename certificate-2.pem`, fixture: "iam/certificate-authority/update-fail.golden", exitCode: 1},
 		{args: "iam certificate-authority list", fixture: "iam/certificate-authority/list.golden"},
 		{args: "iam certificate-authority list -o json", fixture: "iam/certificate-authority/list-json.golden"},