fix(datatable): is-sortable not working with table column cell

[sangeethababu9223]

Related Ticket(s)

Closes #11474

Description

Passing is-sortable to <cds-table-header-cell> makes the column unsortable.
Column being unsortble is already fixed with PR
But clicking on the sort icon makes all the columns sortable, this is fixed.

Changelog

Changed

• expandable and is-selectable attributes mapped to proper variables. This was affecting the sorting action on individual columns.
• Updated the sort action to check if only specific columns are made sortable with is-sortable attribute and if so prevent other columns from showing sort icon.

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