ci: remove serde_core/wasm32v1-none workarounds, re-enable 35+ disabled jobs

The serde_core + Rust 1.88 issue only affects wasm32v1-none target.
wasm32-unknown-unknown works fine, and wasm-builder falls back to it
automatically when wasm32v1-none is not installed.

- Remove all `rustup target add wasm32v1-none` steps (12 files)
- Remove SKIP_WASM_BUILD=1 env vars added as workaround (28 occurrences)
- Re-enable quick-benchmarks job (tests.yml)
- Re-enable check-core-crypto-features job (checks.yml)
- Re-enable 15 build/zombienet jobs (build-publish-images.yml)
- Re-enable test-pezframe-examples-compile-to-wasm and
  test-deterministic-wasm jobs (tests-misc.yml)

Tracking: #355, #357, #358
Upstream: https://github.com/serde-rs/serde/issues/3021 (still open)

.github/workflows/docs.yml

@@ -29,7 +29,6 @@ jobs:
         - /cache/cargo-target/pezkuwi-sdk-docs:/cache/target
     env:
       RUSTFLAGS: "-Cdebug-assertions=y -Dwarnings"
-      SKIP_WASM_BUILD: 1
       CARGO_INCREMENTAL: 0
       CARGO_TARGET_DIR: /cache/target
     steps:
@@ -68,7 +67,6 @@ jobs:
       volumes:
         - /cache/cargo-target/pezkuwi-sdk-docs:/cache/target
     env:
-      SKIP_WASM_BUILD: 1
       CARGO_INCREMENTAL: 0
       CARGO_TARGET_DIR: /cache/target
       RUSTDOCFLAGS: "-Dwarnings --default-theme=ayu --html-in-header ./docs/sdk/assets/header.html --extend-css ./docs/sdk/assets/theme.css --html-after-content ./docs/sdk/assets/after-content.html"