fix e2e about compliance test (#23742)

e2e-tests/cypress/tests/integration/channels/enterprise/system_console/compliance/compliance_export_multiple_post_spec.js

@@ -31,6 +31,10 @@ describe('Compliance Export', () => {
                 teamName = team.name;
             });
 
+            // # Visit a channel and post a message so it has something to be exported initially
+            cy.visit('/');
+            cy.postMessage('hello');
+
             // # Go to compliance page, enable export and do initial export
             cy.uiGoToCompliancePage();
             cy.uiEnableComplianceExport();

e2e-tests/cypress/tests/integration/channels/enterprise/system_console/compliance/compliance_export_ui_spec.js

@@ -33,6 +33,10 @@ describe('Compliance Export', () => {
                 teamName = team.name;
             });
 
+            // # Visit a channel and post a message so it has something to be exported initially
+            cy.visit('/');
+            cy.postMessage('hello');
+
             // # Go to compliance page, enable export and do initial export
             cy.uiGoToCompliancePage();
             cy.uiEnableComplianceExport();

e2e-tests/cypress/tests/integration/channels/enterprise/system_console/compliance/s3_bucket_storage_spec.js

@@ -37,6 +37,10 @@ describe('Compliance Export', () => {
                 teamName = team.name;
             });
 
+            // # Visit a channel and post a message so it has something to be exported initially
+            cy.visit('/');
+            cy.postMessage('hello');
+
             // # Go to compliance page, enable export and do export
             cy.uiGoToCompliancePage();
             cy.uiEnableComplianceExport();