[MM-61652]: Removed unnecessary role and aria-level from channel header (#29540)

* [BST-183]: Removed unnecessary role and aria-level from channel header

* [BST-183]: Fix failing E2E test case

---------

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

e2e-tests/cypress/tests/integration/playbooks/channels/rhs/about_spec.js

@@ -90,7 +90,7 @@ describe('channels > rhs > header', {testIsolation: true}, () => {
             cy.get('#rhsContainer').findByTestId('rendered-run-name').should('be.visible').contains('new run name');
 
             // * make sure the channel name remains unchanged
-            cy.get('#channelHeaderInfo').findByRole('heading').contains(playbookRunName);
+            cy.get('#channelHeaderInfo').contains(playbookRunName);
         });
     });
 

webapp/channels/src/components/channel_header/channel_header_title.tsx

@@ -103,8 +103,6 @@ const ChannelHeaderTitle = ({
                     size='sm'
                 />
                 <strong
-                    role='heading'
-                    aria-level={2}
                     id='channelHeaderTitle'
                     className='heading'
                 >
@@ -141,8 +139,6 @@ const ChannelHeaderTitle = ({
                                 title={channelTitle as string}
                             >
                                 <strong
-                                    role='heading'
-                                    aria-level={2}
                                     id='channelHeaderTitle'
                                     className='heading'
                                     ref={headerItemRef}
@@ -156,8 +152,6 @@ const ChannelHeaderTitle = ({
                             </WithTooltip>
                         ) : (
                             <strong
-                                role='heading'
-                                aria-level={2}
                                 id='channelHeaderTitle'
                                 className='heading'
                                 ref={headerItemRef}