fix(react-charts): prevent histogram bar overlap

[4mthxmas20]

Summary

• prevent numeric VerticalBarChart histograms from adding the extra half-bar domain margin used by non-histogram numeric bars
• add regression coverage that verifies adjacent numeric histogram bars do not overlap
• add a beachball patch change for @fluentui/react-charts

Fixes #36417

Testing

• PASS: node_modules/.bin/jest --config jest.config.js src/components/VerticalBarChart/VerticalBarChart.test.tsx --runInBand
• PASS: corepack yarn prettier --check packages/charts/react-charts/library/src/components/VerticalBarChart/VerticalBarChart.tsx packages/charts/react-charts/library/src/components/VerticalBarChart/VerticalBarChart.test.tsx change/@fluentui-react-charts-00f29ed5-2001-4731-a88c-cdaebc2a2858.json
• PASS: commit hook ran prettier and node ./scripts/lint-staged/src/eslint on staged TS/TSX files

Notes: direct Nx targets (react-charts:test, react-charts:lint, react-charts:type-check) hung locally without output while building the project graph/plugin worker, so I used the package Jest command and targeted formatting/lint-staged verification.

[4mthxmas20]

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