Update Zowe SDKs to 7.27.0 for proxy support

[t1m0thyj]

Problem
In Zowe CLI 7.27.0, proxy support was added using the http-proxy-agent package. This package compiles to an ES2020 target and its source code contains optional chaining which is only supported in ES2020 and up. Since Webpack 4 which we still use for ZE V2 does not support ES2020 syntax, ZE builds fail after updating Zowe CLI to the latest version.

Solution
Investigate a way to fix the Webpack build so that Zowe CLI can be updated. We may need to configure a Babel loader that converts ES2020 code to be compatible with an older target like ES6.

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