fix(decorators): fix private decorator regressions (issue #9565)

[kdy1]

Summary

• fix initProto injection so it is not inserted into private field initializers
• preserve decorator expressions that reference private names (for example, a.#log) instead of hoisting them outside class scope
• replace ignored fixture-style exec coverage for this issue with explicit execution tests in crates/swc/tests/exec.rs using decoratorVersion 2022-03

Tests

• cargo test -p swc --test exec issue_9565
• cargo test -p swc_ecma_transforms_proposal
• cargo test -p swc
• cargo fmt --all
• cargo clippy --all --all-targets -- -D warnings (fails in this checkout due missing test262-parser/pass fixture set in swc_ecma_codegen tests)

Closes #9565

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ kdy1
❌ github-actions[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: b4ee504

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Binary Sizes

File	Size
swc.linux-x64-gnu.node	28M (28581832 bytes)

Commit: e72f9de

[codspeed-hq]

Merging this PR will not alter performance

✅ 184 untouched benchmarks

---

_{Comparing kdy1/fix-issue-9565-decorators-private-fields (b4ee504) with main (431c576)¹}

Footnotes

1. No successful run was found on main (638d7ce) during the generation of this report, so 431c576 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩