Consistent way of displaying numerical data/dates in table component

[rosado]

What

Numerical and dates columns in tables should have govuk-table__cell--numeric class on them.

Why

govuk standard.

Background

As pointed out by @alextea in a comment

Can we any numerical or date columns use the govuk-table__cell--numeric class (George implemented this on the dataset table view)

We should put the appropriate class on numerical data and dates in our table component. Right now the use is inconsistent (e.g. putting the class on a cell vs. a column) and sometimes added to cells with non-number type (example, see the 'reference' column which contains data that looks like a number, but also alphanumerical strings).

[DilwoarH]

Let's remove the govuk-table__cell--numeric class altogether. We do not control or enforce the type of data the user provides; therefore, we can never know if it will be a number or a string.

The GOVUK Design system documentation also suggests using this class only when comparing columns of numbers:

When comparing columns of numbers, align the numbers to the right in table cells.

ref: https://design-system.service.gov.uk/components/table/#numbers-in-a-table

What do you think @alextea?

[DilwoarH]

Things that need to be done if we decide to remove the functionality:

• Remove the use of the class
• Remove the logic that works out if a column has a numeric value