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/build-misc.yml

@@ -43,9 +43,6 @@ jobs:
           rustup show
           rustup +nightly show
 
-      - name: Add wasm32v1-none target
-        run: rustup target add wasm32v1-none || true
-
       - name: Build
         env:
           BIZINIKIWI_RUNTIME_TARGET: riscv