IcPaginationBar - Cannot use 'All' option along with custom ItemsPerPage

[lz405]

Summary of the bug

When using IcPaginationBar along with a custom value for the 'itemsPerPageOptions' prop, the 'All' option does not appear in the 'Items per page' select, regardless of the value of the 'hideAllFromItemsPerPage' prop.

🪜 How to reproduce

Tell us the steps to reproduce the problem:

1. Go to page: https://design.sis.gov.uk/components/navigation/pagination-bar/code/#variants
2. Click on: The 'Items per page' select on the 'Show items per page control' example
3. See that there is no 'All' option

📸 Screenshots or code

There is no 'All' option visible despite the 'hideAllFromItemsPerPage' prop being omitted.

🧐 Expected behaviour

The 'All' option should be visible in the 'Items per page' select

📝 Acceptance Criteria

Allow the 'All' option to be selectable in the 'Items per page' select
Add a cypress test for this case, and set all the skipped tests to be run.

[GCHQ-Developer-299]

Ensure that this does not clash with the behaviour of hideAllFromItemsPerPage
'All' should be appended to the custom list of ItemsPerPage options

[GCHQ-Developer-847]

It was suggested during triage that we could add guidance to our website about not using 'All' if you have a significant amount of items