regression: several webpacked JS files in extensions/ no longer build deterministically

[brjsp]

Starting with version 1.80, Code no longer builds reproducibly. The following is a partial list of files that are wildly different on each rebuild (mostly different mangled variable names):

extensions/css-language-features/client/dist/node/cssClientMain.js
extensions/css-language-features/server/dist/node/cssServerMain.js
extensions/emmet/dist/node/emmetNodeMain.js
extensions/extension-editing/dist/extensionEditingMain.js
extensions/git/dist/askpass-main.js
extensions/git/dist/git-editor-main.js
extensions/git/dist/main.js
extensions/git-base/dist/extension.js
extensions/github/dist/extension.js
extensions/html-language-features/client/dist/node/htmlClientMain.js
extensions/json-language-features/client/dist/node/jsonClientMain.js
extensions/json-language-features/server/dist/node/jsonServerMain.js
extensions/markdown-language-features/server/dist/node/workerMain.js
extensions/media-preview/dist/extension.js
extensions/merge-conflict/dist/mergeConflictMain.js
extensions/npm/dist/npmMain.js
extensions/php-language-features/dist/phpMain.js
extensions/references-view/dist/extension.js
extensions/typescript-language-features/dist/extension.js

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