[data grid] Remove unused classes from gridClasses

[KenanYusuf]

Whilst working on a fix for #16159, I noticed a few classes that are no longer being used. Using this issue to track the unused classes.

The list needs double checking, but I think we can remove:

• detailPanels
• pinnedColumns
• pinnedRowsRenderZone

[mateuseap]

Hi @KenanYusuf!
I’m not sure if it’s too early to proceed, but I can check if it’s okay to remove the classes you've listed and open a PR (I can leave it as a draft). Let me know if I can contribute in any way!

[KenanYusuf]

Hey @mateuseap. Sure, feel free to raise a PR!

[mateuseap]

I checked and removed only pinnedRowsRenderZone for now. I haven’t fully looked into the other two classes yet. The PR is open!

[KenanYusuf]

Thanks for opening the PR @mateuseap - it looks good. Do you plan to look at the other two classes?

[mateuseap]

I'll be happy to take a look as soon as I have some time. If you'd like to do it sooner, that's completely fine!

Would you prefer that I add it to my current PR, or should I leave it as is and open a new one? @KenanYusuf

[KenanYusuf]

Awesome - it's ok to add to the current PR since the changes are related.

I will pick it up next week if you don't find time.

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