* chore: bump @npmcli/template-oss from 3.4.1 to 3.4.2

Bumps [@npmcli/template-oss](https://github.com/npm/template-oss) from 3.4.1 to 3.4.2.
- [Release notes](https://github.com/npm/template-oss/releases)
- [Changelog](https://github.com/npm/template-oss/blob/main/CHANGELOG.md)
- [Commits](npm/template-oss@v3.4.1...v3.4.2)

---
updated-dependencies:
- dependency-name: "@npmcli/template-oss"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* chore: postinstall for dependabot template-oss PR

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Luke Karrys <luke@lukekarrys.com>

* chore: bump @npmcli/template-oss from 3.4.2 to 3.4.3

Bumps [@npmcli/template-oss](https://github.com/npm/template-oss) from 3.4.2 to 3.4.3.
- [Release notes](https://github.com/npm/template-oss/releases)
- [Changelog](https://github.com/npm/template-oss/blob/main/CHANGELOG.md)
- [Commits](npm/template-oss@v3.4.2...v3.4.3)

---
updated-dependencies:
- dependency-name: "@npmcli/template-oss"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* chore: postinstall for dependabot template-oss PR

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: npm team <ops+robot@npmjs.com>

This refactors the code to use async functions where possible.
It also uses `@npmcli/fs` consistently (it was already a dependency,
just not used).
It also reorders the test files to match their sources in `./lib`.

Tests were not refactored (except where needed to move to `@npmcli/fs`)
in the interest of an easier PR review.

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>