[META] [AXE-CORE]: Enable axe checks for all EUI components

[1Copenut]

UPDATE:
I'm turning this into a meta issue. During the discovery phase, I am uncovering child element issues that will have to be resolved before I can close this parent issue. Additional issues will be added as I bring components back under test, one or two at a time.

Description

The a11y testing script excludes some of the EUI components from testing. I'm proposing to enable axe checks for all components. This may include the following refactors:

• Making adjustments to individual components as needed
• Adjusting the configuration object using the axe-core API
• Researching how Cypress might enhance these checks

Child issues

• [AXE-CORE]: Update configuration object and bump version to latest #5308
• [EuiAccordion][AXE-CORE]: Review the interactive content in trigger pattern for ARIA attribute violation #5766
• [EuiAccordion][AXE-CORE]: Review the accordions that create a fieldset for ARIA attribute violation #5767
• [EuiResizableContainer][AXE-CORE]: Containers must allow keyboard users to access all content #5295
• [EuiStat] Description containing focusable elements causes accessibility tests to fail #5273
• [EuiDatePicker] Time selection has accessibility issues #2161
• [EuiColorPalettePicker][COGNITION]: The sr-only accessible label is not announcing what color palette is selected #5367
• [EuiSuperSelect][AXE-CORE]: Super select listbox must have an accessible label #5292
• [EuiComboBox][AXE-CORE]: Add documentation and aria-label attribute to examples to improve screen reader usability #5267
• [EuiSuggest][AXE-CORE]: Applied filters have nested interactive elements that won't be announced by screen readers #5293
• [EuiAvatar][AXE-CORE]: Ensure we're treating avatars as [role="img"] or [role="presentation"] #5289
• [EuiHeader][AXE-CORE]: Ensure ARIA attributes are allowed for an element's role #5288
• [EuiDatePicker][AXE-CORE]: Ensure IDs are unique for each time picker item #5304
• [EuiConfirmModal] Title should be wrapped in an HTML heading if provided as a string #5276
• [EuiDatePicker][AXE-CORE]: aria markup needs to be adjusted for best screen reader experience #5303
• [EuiDatePicker][AXE-CORE]: UL role="listbox" must have the tabindex attribute for proper listbox interaction #5296
• [EuiComboBox][AXE-CORE]: All comboboxes must have an accessible label #5302
• [EuiKeyPadMenu][AXE-CORE]: Nested elements that can take focus will not be announced by screen readers #5290
• [EuiComboBox][COGNITION]: Focusable close buttons should not have a nested element with tabindex #5545
• [EuiDragAndDrop][AXE-CORE]: Nested drag and drop buttons will not be announced by screen readers #5294
• [EuiSelectable][AXE-CORE]: UL role="listbox" must have the tabindex attribute when we have a combined input an list #5298
• [EuiComboBox][AXE-CORE]: aria markup needs to be adjusted for best screen reader experience #5301

[1Copenut]

Closing because this issue is superseded by #6252