fix: enclose SAML authn context values in brackets

When writing multiple values for the SAML_AUTHN_CONTEXT setting, the entire
value must be enclosed in square brackets ([]), otherwise the service will
treat the entire value as one context.

npm test passes

Author: p4-nathan

lib/features/admin/domain/usecases/ConvertFromProviders.js

@@ -68,7 +68,7 @@ function convert(settings, provider, mapping, deleteFn) {
             settings.set(env, contexts[0])
           } else {
             const authnContext = contexts.map((e) => `"${e}"`).join()
-            settings.set(env, authnContext)
+            settings.set(env, `[${authnContext}]`)
           }
         }
       } else {

test/features/admin/domain/usecases/ConvertFromProviders.test.js

@@ -60,7 +60,7 @@ describe('ConvertFromProviders use case', function () {
       'urn:oasis:names:tc:SAML:2.0:ac:classes:Kerberos',
       'urn:oasis:names:tc:SAML:2.0:ac:classes:Password'
     ]
-    const authnContext = contexts.map((e) => `"${e}"`).join()
+    const authnContext = '[' + contexts.map((e) => `"${e}"`).join() + ']'
     const settings = new Map()
     const providers = [{
       label: 'Acme Identity',

test/features/admin/domain/usecases/WriteConfiguration.test.js

@@ -278,7 +278,7 @@ describe('WriteConfiguration use case', function () {
       'urn:oasis:names:tc:SAML:2.0:ac:classes:Kerberos',
       'urn:oasis:names:tc:SAML:2.0:ac:classes:Password'
     ]
-    const authnContext = contexts.map((e) => `"${e}"`).join()
+    const authnContext = '[' + contexts.map((e) => `"${e}"`).join() + ']'
     const readStub = sinon.stub(ConfigurationRepository.prototype, 'read').callsFake(() => {
       return new Map()
     })