[Pagination]: improve order of select labeling for screen readers

[laurenmrice]

Acceptance criteria

From Michael Gower as part of omnibus website doc issue #3238

Pagination a11y issues

Labeling

• The labeling is not great for a screen reader, and I think there could be ways of making it better. The simplest is:
• "Page: [12 of 40] v" instead of "[12] v of 40 pages"
• I've used the "[ ] v" to represent where the input and down chevron is/could be. That would need to be tested, but with zero real difference to a sighted user could likely be a much better screen reader or magnified result. Note that this also works when the unknown variant is enabled

• Speaking of putting "Page" in front of the right-side input, almost all the variations in Figma already show that, so it would result in a more consistent layout

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Other dev improvements to consider
There are more holistic changes that could be made, but this would be a pretty easy one to do.

• The current design also requires you to do something with the 'orphan' text when it comes to building a label. At the moment, Carbon has used a hidden aria label that is populated based on values on screen, but I think an aria-describedby is more elegant and also better supports internationalization.

<label for="cds-pagination-select-id-5-right" class="cds--label cdes--visually hidden">Page number, of 6 pages</label>

• They could just take the select itself and use aria-describedby to link it with an ID they assign to

<span class"cds--pagination__text">of 6 pages</span>

• The speech output with Jaws is much smoother, IMO.

• I've made a small recording of current and improved screen reader behavior. If combined with the above suggestion on labeling changes, this would result in real improvement.

• The chunk of text after the first input ("1 to 10 of 103 items" in the image above) should be tested as a live region. The advantages of this: when a user incremented the prior or next pages, or when a user changed the number of records shown OR potentially when the filtering was altered, this would be announced by the screen reader. Could be VERY useful.

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