[roll] Roll fuchsia [ffx][fho] move TryFromEnv to associated error types tree-wide

Evolve the centralized `fho` dependency injection traits (`TryFromEnv` and
`TryFromEnvWith`) to introduce associated `Error` parameters, eliminating
dynamic type erasure tree-wide.

- fho/src/try_from_env.rs: Parameterize traits and update all baseline
  container blocks (() and holders).
- fho/macro/src/structs.rs: Refactor the `#[derive(FfxTool)]` code generator
  to inject individual `.map_err(...)` wrappers around each field future,
  ensuring error homogeneity inside `try_join!` setups.
- Prune unused anyhow links from `ffx_writer/BUILD.gn`.
- Synchronize all manual implementations across the workspace (target holders,
  connectors, emulator, debug, log, and audio plugin bounds).

Test: fx test fho && fx build
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1602097
Original-Original-Revision: 63358d134d84dd662a2e51c1a212fe681b881dcb
GitOrigin-RevId: 568fbb8132327da8d5a4bf829e5fa03290885099
Change-Id: I26b799f7032a15cbc7ece8d67052aeba7d9fa6ec
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1616794
Cr-Commit-Position: refs/heads/main@{#192925}