Upgrade React on Rails/Shakapacker and standardize on Rspack v2

**Metr Tracking Issue**

**Category**: large_feature
**Commits**: 1
**Lines changed**: 1876 (+919/-957)
**Time span**: 0 hours

**PRs**:
- #702 - Upgrade React on Rails/Shakapacker and standardize on Rspack v2

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<summary>Commit details</summary>

- `98f833a` Upgrade React on Rails/Shakapacker and standardize on Rspack v2 (#702) (+919/-957)

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