[Bug]: Vite runs define replacements in story-source

[IanVS]

Describe the bug

Vite is performing define replacements on the code in story source, which is a problem for a few reasons:

1. The code that appears there should appear largely as-written by the developer, so environment variables should remain intact (probably?).
2. It replaces with double-quotes, which breaks syntax since the whole source string is inside double quotes.

To Reproduce

See https://github.com/storybookjs/storybook/pull/19805#discussion_r1021023879

System

No response

Additional context

I've fixed this in the past with storybookjs/builder-vite#364. I wonder if this has started to break now with the change to story-source from a webpack loader to an unplugin.

[shilman]

Note: we are moving back to source-loader for storysource, so your old fix should apply. Issue to track #20421

[mayank99]

unsure if this is related, but i've noticed that after upgrading to 7.0 that story code doesn't load when using the vite builder.

see dedicated issue: #20475