[A11y] Make announcers read the version history table data correctly.

[dannyjdev]

Added tabindex to every td tag on the version history table so that the value can be announced using NVDA or other announcers.

Addresses #8491

[loic-sharma]

Do we need to add tabindex on all our tables? For example, all our statistics tables here: https://www.nuget.org/stats

[ryuyu]

As long as keyboard nav isn't wonky with this change, it looks good to me.

[dannyjdev]

Do we need to add tabindex on all our tables? For example, all our statistics tables here: https://www.nuget.org/stats

They already have the tabindex=0, and as far as I know they are A11y compliant.

@ryuyu tabindex allows us to traverse the table cell by cell, before we could only traverse the Version and Status column because the values from those rows are links.