Use execa 6.x in scripts

[tmeasday]

We need to use an obtuse method to import it as it is ESM only and ts-node doesn't play well with that.

See TypeStrong/ts-node#1290

How to test

I'm not sure how to test all the other scripts, but if the CI passes, the task runner is working

[ndelangen]

@tmeasday

All looks good to me, except for this failure:

Error [ERR_REQUIRE_ESM]: require() of ES Module /tmp/storybook/scripts/node_modules/execa/index.js from /tmp/storybook/scripts/combine-compodoc.ts not supported.
Instead change the require of index.js in /tmp/storybook/scripts/combine-compodoc.ts to a dynamic import() which is available in all CommonJS modules.
    at Object.require.extensions.<computed> [as .js] (/tmp/storybook/scripts/node_modules/ts-node/dist/index.js:851:20)
    at Object.<anonymous> (/tmp/storybook/scripts/combine-compodoc.ts:10:17)
    at Module.m._compile (/tmp/storybook/scripts/node_modules/ts-node/dist/index.js:857:29)
    at Object.require.extensions.<computed> [as .ts] (/tmp/storybook/scripts/node_modules/ts-node/dist/index.js:859:16)
    at phase4 (/tmp/storybook/scripts/node_modules/ts-node/dist/bin.js:466:20)
    at bootstrap (/tmp/storybook/scripts/node_modules/ts-node/dist/bin.js:54:12)
    at main (/tmp/storybook/scripts/node_modules/ts-node/dist/bin.js:33:12)
    at Object.<anonymous> (/tmp/storybook/scripts/node_modules/ts-node/dist/bin.js:579:5) {
  code: 'ERR_REQUIRE_ESM'