Restore core-js to csf-tools

It uses regexp.flags, which our browserslist thinks needs to be polyfilled. I think this can be removed again once we move csf-tools from babel to esbuild.
storybookjs · Sep 3, 2022 · 51acd12 · 51acd12
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commit 51acd12
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diff --git a/code/lib/csf-tools/package.json b/code/lib/csf-tools/package.json
@@ -42,6 +42,7 @@
     "@babel/traverse": "^7.12.11",
     "@babel/types": "^7.12.11",
     "@storybook/csf": "0.0.2--canary.0899bb7.0",
+    "core-js": "^3.8.2",
     "fs-extra": "^9.0.1",
     "global": "^4.4.0",
     "ts-dedent": "^2.0.0"

diff --git a/code/yarn.lock b/code/yarn.lock
@@ -7279,6 +7279,7 @@ __metadata:
     "@types/jest": ^26.0.16
     "@types/jest-specific-snapshot": ^0.5.3
     babel-loader: ^8.2.5
+    core-js: ^3.8.2
     enzyme: ^3.11.0
     enzyme-to-json: ^3.6.1
     glob: ^7.1.6
@@ -7511,6 +7512,7 @@ __metadata:
     "@types/react-dom": ^16.9.14
     "@types/tmp": ^0.2.3
     autoprefixer: ^9.8.6
+    core-js: ^3.8.2
     cross-spawn: ^7.0.3
     find-up: ^5.0.0
     fork-ts-checker-webpack-plugin: ^7.2.6
@@ -8187,6 +8189,7 @@ __metadata:
     "@storybook/csf": 0.0.2--canary.0899bb7.0
     "@storybook/mdx2-csf": ^0.0.3
     "@types/fs-extra": ^9.0.6
+    core-js: ^3.8.2
     fs-extra: ^9.0.1
     global: ^4.4.0
     js-yaml: ^3.14.1