Update dependency @apollo/react-testing to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@apollo/react-testing	3.1.4 -> 4.0.0

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Release Notes

apollographql/react-apollo

v4.0.0

Compare Source

⚠️ Deprecation Notice ⚠️

Please note that this is the final version of all React Apollo packages, and that this repository is going to be archived. React Apollo functionality is now directly available from @apollo/client >= 3. While using the @apollo/react-X packages will still work, we recommend using the following imports from @apollo/client directly instead:

• old: @apollo/react-components --> new: @apollo/client/react/components
• old: @apollo/react-hoc --> new: @apollo/client/react/hoc
• old: @apollo/react-ssr --> new: @apollo/client/react/ssr
• old: @apollo/react-testing --> new: @apollo/client/testing
• old: @apollo/react-hooks --> new: @apollo/client

Breaking Changes

• React Apollo 4.0.0 is dependent on @apollo/client >= 3. If you are using apollo-client 2.x and are not ready to update to @apollo/client, please use React Apollo 3.x.

• The react-apollo package has been fully removed. Please use @apollo/client or @apollo/react-X packages directly.
  
  @​hwillson in #​4037

• Due to changes made in Apollo Client, the previous SSR testing pattern of:

  return getDataFromTree(app).then(() => {
    const markup = ReactDOM.renderToString(app);
    expect(markup).toMatch(/Waldo/);
  });

  will no longer work (ReactDOM.renderToString(app) will just return the initial loading state of the component under test). Instead, we can leverage the markup returned when getDataFromTree's Promise resolves:

  return getDataFromTree(app).then((markup) => {
    expect(markup).toMatch(/Waldo/);
  });

• We are no longer building UMD versions of React Apollo.

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