a11y: [Epic]: Keyboard Navigation and associated focus display/role/aria-label

[kwwii]

• a11y: Fix keyboard navigation, aria-label, role and focus display for top-left hamburger menu #12769 -> Fix top-level burger menu keyboard navigation #12876
• a11y: Create accessible Menu component #12771
• a11y: Fix keyboard navigation, aria-labels, roles and focus display for page-level action menu #12772
• a11y: Fix keyboard navigation, aria label/role and focus display for app bar #12774 -> fix keyboard nav for app bar #12958
• a11y: Fix keyboard navigation, role, aria-label and focus display issues on the login screen #12775 -> fix keyboard nav on login screen #12956
• a11y: Fix keyboard navigation and focus display issues on the home screen #12776 -> fix keyboard nav for home page #12966
• a11y: Fix keyboard navigation and focus display issues on the account and api keys screen #12777
• a11y: Fix keyboard navigation, label and focus display issues on the import yaml screen #12778
• a11y: Fix keyboard navigation, aria-label, role and focus display issues on the namespace chooser control #12779
• a11y: Fix keyboard navigation, role, aria-labels and focus display issues on the side navigation component #12780
• a11y: Fix keyboard navigation and focus display for cluster appearance configuration #12781
• a11y: Fix keyboard navigation, labels/descriptions, roles and focus display for workload health (scale up/down) control #12782
• a11y: Fix keyboard navigation and focus display for charts grid #12783
• a11y: Fix keyboard navigation and focus display for banner control close #12784
• a11y: Fix keyboard navigation and focus display for Extensions grid view #12785
• a11y: Fix keyboard navigation and focus display for about page #12786 -> fix keyboard nav for about page #12959
• a11y: Fix keyboard navigation and focus display for Global Settings #12787
• a11y: Fix keyboard navigation, aria label/role and focus display for user menu #12790
• a11y: Fix keyboard navigation, aria-label, role and focus display for user preferences screen #12791
• a11y: Fix keyboard navigation, label and focus display issues on the sortable table #12794
• a11y: Fix keyboard navigation and focus display issues on the combobox component #12795
• a11y: Fix keyboard navigation, labels/descriptions, roles and focus display for miscellaneous single occurrences #12811

[kwwii]

#7892