Remove outdated section in docs

[jerelmiller]

Removes the "Legacy support" section on the reducing bundle size doc which is no longer relevant to v4.

[changeset-bot]

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Latest commit: e3c58b9

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[pkg-pr-new]

npm i https://pkg.pr.new/apollographql/apollo-client/@apollo/client@13028

commit: e3c58b9

[apollo-librarian]

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* (developer-tools)/react/(latest)/development-testing/reducing-bundle-size.mdx

Build ID: 73e1b670662fd558b061efca
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URL: https://www.apollographql.com/docs/deploy-preview/73e1b670662fd558b061efca