[code-infra] Revert ESM update for toolpad-core

[Janpot]

Wait for both X and core to be in beta with their updated package layout before making this change to @toolpad/core. We can keep it for @toolpad/utils.

[mui-bot]

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[apedroferreira]

Nice! I had actually ran into this too but wasn't sure if this was the fix.

[apedroferreira]

Oh wait, I guess we need to update the versions for development, the playground apps and the examples accordingly?
And create-toolpad-app.
But I can take care of that.

[Janpot]

Oh wait, I guess we need to update the versions

Yes, and I haven't tested what this does for Studio

[apedroferreira]

Oh wait, I guess we need to update the versions

Yes, and I haven't tested what this does for Studio

Hopefully nothing too breaking, I'll try in a separate PR.

[Janpot]

@apedroferreira I'm reverting this until X publishes their beta. Core v7 is not compatible with X v7.

[apedroferreira]

Seems to have fixed the issue, just tested with the CodeSandbox version!

The dev scripts in toolpad-core and toolpad-utils are still broken but they already were since the scripts it uses changed so it doesn't need to block this. I guess we will need some kind of alternative there, didn't look to deep into it yet.

[Janpot]

I guess we will need some kind of alternative there, didn't look to deep into it yet.

I'll fix this in core