feat: Progress bar updates are announced to the user

[Al-Dani]

Description

Additional dynamic-aria-live helper component is used to announce progress bar status in progress. Screenreader makes announcement not more often than specified interval. For progress updates this interval is set to 5 second to reduce noise with a small update granularity.

Related links, issue #, if available: AWSUI-19156

How has this been tested?

Manually, using screenreader. New Integration test is also presented.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

Base: 92.40% // Head: 92.50% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (4bf7eca) compared to base (d708896).
Patch coverage: 93.93% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
+ Coverage   92.40%   92.50%   +0.09%     
==========================================
  Files         571      574       +3     
  Lines       16218    16351     +133     
  Branches     4443     4484      +41     
==========================================
+ Hits        14986    15125     +139     
+ Misses       1149     1145       -4     
+ Partials       83       81       -2     

Impacted Files	Coverage Δ
src/progress-bar/internal.tsx	95.45% <ø> (ø)
src/internal/components/live-region/index.tsx	83.33% <66.66%> (-4.17%)	⬇️
src/internal/components/live-region/utils.ts	87.50% <87.50%> (ø)
...rc/internal/components/dynamic-aria-live/index.tsx	100.00% <100.00%> (ø)
.../internal/components/live-region/aria-liva-tag.tsx	100.00% <100.00%> (ø)
src/progress-bar/index.tsx	100.00% <100.00%> (ø)
src/mixed-line-bar-chart/chart-container.tsx	85.78% <0.00%> (-4.72%)	⬇️
src/mixed-line-bar-chart/internal.tsx	91.00% <0.00%> (-3.00%)	⬇️
src/internal/styles/colors.ts	100.00% <0.00%> (ø)
src/table/body-cell/index.tsx	100.00% <0.00%> (ø)
... and 20 more

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