[MM-57085] Remove UseNewSAMLLibrary experimental setting (#26392)

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/cypress/tests/integration/channels/enterprise/saml/okta_login_spec.js

@@ -59,9 +59,6 @@ context('Okta', () => {
             UsernameAttribute: 'Username',
             LoginButtonText: loginButtonText,
         },
-        ExperimentalSettings: {
-            UseNewSAMLLibrary: true,
-        },
         GuestAccountsSettings: {
             Enable: true,
         },

e2e-tests/cypress/tests/integration/channels/enterprise/saml/saml_automated_spec.js

@@ -55,9 +55,6 @@ context('LDAP SAML - Automated Tests (SAML TESTS)', () => {
             UsernameAttribute: 'Username',
             LoginButtonText: loginButtonText,
         },
-        ExperimentalSettings: {
-            UseNewSAMLLibrary: false,
-        },
         GuestAccountsSettings: {
             Enable: true,
         },

e2e-tests/cypress/tests/support/api/on_prem_default_config.json

@@ -484,7 +484,6 @@
         "ClientSideCertCheck": "secondary",
         "LinkMetadataTimeoutMilliseconds": 5000,
         "RestrictSystemAdmin": false,
-        "UseNewSAMLLibrary": false,
         "EnableSharedChannels": false,
         "EnableRemoteClusterService": false,
         "DisableAppBar": false,