Improve gauge chart screen reader accessibility

[krkshitij]

Previous Behavior

The screen reader fails to announce the current value when the meter indicator is focused.

New Behavior

The screen reader announces the current value when the meter indicator is focused.

https://github.com/microsoft/fluentui/assets/110246001/22489c14-60c6-4213-87c6-c196991a8c4c

[fabricteam]

📊 Bundle size report

✅ No changes found

[size-auditor[bot]]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 262900bd47ddaa279b97f229b213f8a0ad796535 (build)

[codesandbox-ci[bot]]

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[fabricteam]

🕵 fluentuiv8 No visual regressions between this PR and main

[AtishayMsft]

Kshitij can you share a video of the improved behavior.