[codex] Restore container e2e workspace package

[andrewtdiz]

Summary

• restore crates/perry-container-e2e as an explicit workspace member
• record the newly visible package in Cargo.lock
• leave default-members unchanged so default workspace builds do not pick up env-gated E2E tests

Root Cause

The Layer D container workflow still invokes cargo test -p perry-container-e2e --test e2e_container, and the crates/perry-container-e2e crate/test target still exists. The crate had fallen out of root workspace membership, so Cargo failed package resolution before the E2E skip gates or tests could run.

Validation

• cargo test -p perry-container-e2e --test e2e_container -- e2e_redis_smoke --test-threads=1
• cargo test -p perry-container-e2e --test e2e_container -- e2e_forgejo_stack --test-threads=1
• cargo metadata --no-deps --format-version 1 | jq -r .packages[] | select(.name == "perry-container-e2e") | .manifest_path
• git diff --check
• ./scripts/check_file_size.sh