Simplify (questionable?) VcTransparentRead by merging T and Repr

[bgw]

Update: Closed. I plan to take a different approach: #8843 (comment)

The plan is to drop collection generics, which will also remove the need for the Repr type.

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[bgw]

• Simplify (questionable?) VcTransparentRead by merging T and Repr #8810 👈
• main

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[github-actions]

🟢 Turbopack Benchmark CI successful 🟢

Thanks

[github-actions]

⚠️ This change may fail to build next-swc.

Logs

crates/next-core/src/next_telemetry.rs:42:9: �[38;5;9merror[E0271]: type mismatch resolving `<DiagnosticPayload as VcValueType>::Read == VcTransparentRead<DiagnosticPayload, HashMap<RcStr, _>, _>`
crates/next-core/src/next_telemetry.rs:82:9: �[38;5;9merror[E0271]: type mismatch resolving `<DiagnosticPayload as VcValueType>::Read == VcTransparentRead<DiagnosticPayload, HashMap<RcStr, _>, _>`
error: could not compile `next-core` (lib) due to 2 previous errors

See job summary for details

[github-actions]

⚠️ CI failed ⚠️

The following steps have failed in CI:

• Turbopack Rust tests (mac/win, non-blocking)

See workflow summary for details

[bgw]

Closing PR, as I plan to take a different approach: #8843 (comment)

The plan is to drop collection generics, which will also remove the need for the Repr type.