Added aria-live search results in around page

[lucascumsille]

Part of TFL Accessibility audit.

This commit helps screen reader to notify the user once the map results have been updated triggering a change in the number of results.

Please check the following:

• [ ] Has the code POD documentation been added or updated?
• [ ] Whether this PR should include changes to any public documentation, or the FAQ;
• [ ] All cobrand-specific commits start their commit message with the cobrand in square brackets;
• [ ] Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• [ ] Will cobrand-specific changes require additional work to ensure consistent behaviour on www.fixmystreet.com?
• [ ] Are the changes tested for accessibility?
• [ ] Have you updated the changelog? If this is not necessary, put square brackets around this: skip changelog

Please check the contributing docs, and describe your pull request here. Screenshots or GIF animations (using e.g. LICEcap) may be helpful.

Please include any issues that are fixed, using "fixes" or "closes" so that they are auto-closed when the PR is merged.

Thanks for contributing!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.62%. Comparing base (a40ff3f) to head (fa8b715).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5017 +/- ## ======================================= Coverage 82.61% 82.62% ======================================= Files 395 395 Lines 30803 30803 Branches 4884 4884 ======================================= + Hits 25449 25452 +3 + Misses 3906 3905 -1 + Partials 1448 1446 -2 ```

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