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Draft: Uses esbuild for asset minification via esbuild-loader

Sean Gregory requested to merge sg/esbuild-minification into master

What does this MR do and why?

This MR tentatively introduces minification of production assets using esbuild via esbuild-loader.

This is a part of a larger effort to migrate to webpack 5.

Minification with esbuild should reduce production asset compilation time, but also reduces the minimum resource requirements for webpack 5.

More context about the performance benchmarks can be found in this issue: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1346

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