Disabled Typescript no-undef rule per typescript-eslint #477

[andyhopp]

This PR resolves #7167 by disabling the no-undef rule for typescript-eslint. As pointed out in typescript-eslint/typescript-eslint#477, no-undef is handled by the Typescript compiler.

I have verified that errors are thrown by taking the example in the above issue and mangling the name of the namespace to "connect0" and verifying that compiler errors are thrown:

Failed to compile.

/Users/andyhopp/Projects/connect-react-example/src/connect-service.ts
TypeScript error in /Users/andyhopp/Projects/connect-react-example/src/connect-service.ts(6,9):
Cannot find name 'connect0'. Did you mean 'Connect'?  TS2552

    4 | 
    5 |     public initialize(ccpElement: HTMLElement, options: connect.InitCCPOptions) {
  > 6 |         connect0.core.initCCP(ccpElement, options);
      |         ^
    7 |         console.log('CCP Initialized!');
    8 |     }
    9 | }


npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! connect-react-example@0.1.0 build: `react-scripts build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the connect-react-example@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/andyhopp/.npm/_logs/2019-06-06T15_36_52_376Z-debug.log

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at cla@fb.com. Thanks!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[Timer]

Thanks!