remove @ember/render-modifiers resolution

[Dhaulagiri]

📌 Summary

removes the @ember/render-modifiers resolution we had in place to work around a bug

🛠️ Detailed description

This was added in #651 to work around a specific issue we were seeing using field-guide, but we are no longer using that tool so this resolution is not needed. As an added bonus, this also moves us to the 2.1 release of @ember/render-modifiers which includes support for Ember 5.x

📸 Screenshots

~/c/w/design-system (br-render-modifier|✔) $ yarn why @ember/render-modifiers
├─ @hashicorp/design-system-components@workspace:packages/components
│  └─ @ember/render-modifiers@npm:2.1.0 [3aeb9] (via npm:^2.0.5 [3aeb9])
│
├─ ember-basic-dropdown@npm:7.2.2
│  └─ @ember/render-modifiers@npm:2.1.0 [84211] (via npm:^2.0.5 [84211])
│
├─ ember-prism@npm:0.13.0
│  └─ @ember/render-modifiers@npm:2.1.0 [84211] (via npm:^2.0.5 [84211])
│
└─ ember-stargate@npm:0.4.3
   └─ @ember/render-modifiers@npm:2.1.0 [84211] (via npm:^2.0.5 [84211])

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