chore: workaround for browserslist (PROVCON-5709)

[darekplawecki]

Fixes the e2e-react-cra build failure introduced by the browserslist bump (ce4d017):

  Failed to compile.
  ./node_modules/react-router-dom/server.js 215:41
  Module parse failed: Unexpected token (215:41)
  >         v7_partialHydration: opts.future?.v7_partialHydration === true,

Cause

• The bump pulled in newer caniuse-lite data. With it, every browser matched by the production query (>0.2%, not dead, not op_mini all) supports optional chaining (?.).
• Babel therefore stopped transpiling ?. in node_modules.
• CRA 4 uses webpack 4, which can't parse ?..
• The e2e build uses local elements-core, which imports react-router-dom/server.js. That is where it failed.

Fix

• Add "chrome 79" to browserslist.production in examples/react-cra/package.json. Chrome 79 is the last version without ?., so Babel transpiles it again.

Impact

• Only the example app's bundle changes: slightly larger output. The published packages are unaffected.
• The browserslist CVE fix stays in place.
• This is a workaround for CRA 4's webpack 4. It can go away if the example moves off CRA.

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