[BUG] [a11ty] Navigate table headers with keyboard

[TomasLongo]

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Describe the bug

When using the table visualization, table columns should be reachable by tabbing. However, the user can only reach the first column. After that, the focus immediately jumps to the sidebar, no matter if it is collapsed or not.

Users relying on the keyboard for navigation are not able to modify the sorting of any column but the first.

To Reproduce

Steps to reproduce the behavior:

1. Create a table visualization and add a few columns
2. Click on any element to set the focus
3. Press tab until focus lands on the first column header
4. Press tab another time and watch the focus jump to the sidebar

Expected behavior

I would expect the focus to visit all available column header so that I can modify the sorting of any given column just by using the keyboard

OpenSearch Version

2.19.2

Dashboards Version

2.19.2

Plugins

Screenshots

Host/Environment (please complete the following information):

• OS: Ubuntu 22.04.1
• Chrome

Additional context