[6.x] [build/ts] transpile public code with webpack-specific ts config (#21865) #21893
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…stic#21865) Right now the build process is running TypeScript code through a single transpilation process which produces the JS code that ships with the distributable. This process causes problems because when running the optimizer from source we use a slightly different config https://github.com/elastic/kibana/blob/33c6ade75631fb3f56816bc134dff83d08f4f387/src/optimize/base_optimizer.js#L312-L313, which instructs typescript to build modules using ESM, which webpack understands, but in the build we transpile this TypeScript to commonjs, which does not support features that are important to the strategy we are using to maintain BWC with the legacy platform as we migrate to the new platform. This implements a `tsconfig.browser.json` file at the root of the repository that extends the default `tsconfig.json` file and includes a `src/**/public/**/*` code, which the root `tsconfig.json` file now excludes. This new config file is added to the list of projects that we lint, is shared with webpack, and is built along with the default project in the build process to create JS code that uses esm for webpack to consume.
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Backports the following commits to 6.x: