Improve CI for NAPI-RS

[RobinMalfait]

This PR updates the CI workflows related to NAPI-RS. So far, we've been using a custom ghcr.io based image, but these run on Node v18.

With this PR, I created a new project using napi new, with GitHub Actions workflow setup. Then essentially ported the changes from that new project to this project (as minimal as possible).

The main goal was to be able to bump NAPI-RS related dependencies and get an insiders release out. The images used in these CI jobs were blockers to get an actual (insiders) release out.

Test plan

1. CI still passes
2. Added a dry-run on the prepare release workflow to test that we got through the entire workflow without issues

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

This pull request updates GitHub Actions workflows across four files. The pnpm/action-setup action is upgraded from v4 to v6 in ci.yml, integration-tests.yml, prepare-release.yml, and release.yml. The prepare-release.yml and release.yml workflows undergo significant restructuring: the Linux build matrix removes per-target Docker container usage and instead introduces per-target build-flags, expands cargo caching configuration, adds Zig tooling setup for musl targets, implements conditional stripping logic based on target architecture, and adds targeted apt package installation for aarch64. The prepare-release.yml workflow also introduces a new dry_run workflow input parameter with default value true.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Improve CI for NAPI-RS' directly relates to the main focus of the changeset, which comprehensively updates CI workflows and GitHub Actions configurations for NAPI-RS.
Description check	✅ Passed	The description clearly explains the context and motivation for the CI workflow updates, including replacing custom container images and porting changes from a fresh NAPI-RS project setup.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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