[v13.0.0-beta.2] Toast and aria-live text punctuation

[microbit-robert]

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Description

The aria-live region now coalesces messages together when required, however, the messages lack punctuation, and when they are concatenated, the screen outputs one long sentence with varying levels of sense.

Reproduction steps

Priority

No response

Stack trace

Screenshots

Example: "moving on workspace" is appended to the move mode hint but no full stop separates these two distinct sentences so they are no longer distinct.

Browsers

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[maribethb]

Aaron implemented with newlines but that doesn't appear to be working with voiceover

options:

• make sure the messages themselves have proper punctuation so they're already separated naturally
• add additional punctuation like / or - or something
• both?

there's no drawback to doing #1 and I think also doing the second is fine as well

[mikeharv]

This PR addresses option 1 from @maribethb in the comment above: #9817

If this sufficiently addresses the problem, we should be able to close the ticket on merge. Otherwise we can consider option 2 (additional punctuation).