fix(room-kit): show 12 PM and 12 AM correctly in chat message time

[RaphaelFakhri]

Description

Chat messages show the wrong time for hours 12 to 12:59. getTimeStringin12HourFormat chooses the notation with hours / 12 > 1, which is false for 12, and it maps hour 0 and hour 12 to 00. A message sent at 12:30 in the afternoon renders as 00:30 AM, and a message sent at 00:05 renders as 00:05 AM instead of 12:05 AM.

This change uses hours >= 12 for the PM notation and hours % 12 || 12 for the displayed hour. It also configures the package's Jest transform to use @react-native/babel-preset, because metro-react-native-babel-preset from babel.config.js is not installed in this package, so yarn test cannot run any test today.

Test command: cd packages/react-native-room-kit && npx jest src/utils/functions.time.test.tsx

Fixes #1709

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Additional context

Without the source change, the new test fails 3 of 7 cases (00:05, 12:00 and 12:30). With the change, all 7 pass.

Pre-launch Checklist

• The Documentation is updated accordingly, or this PR doesn't require it.
• I have updated the ExampleAppChangelog.txt file with relevant changes.
• I updated/added relevant documentation (doc comments with ///).
• I listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

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