[review] fix(setup-js): wrap all sync fs calls in try/catch (eslint-monster remediation)

[github-actions]

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This PR contains changes that were originally intended for PR #46102 (copilot/eslint-monster-wrap-fs-calls).
Please review the changes carefully before merging.

[github-actions]

Thanks for keeping this narrowly scoped to the sync fs error-handling remediation and for including a concise changeset summary.

This repo's CONTRIBUTING.md says non-core contributors should not open direct PRs; contributions are expected to come through issues/agentic plans, with core team members creating implementation PRs. This PR also appears to be authored by automation while GitHub reports the PR author association as CONTRIBUTOR, so it needs a process check before review can proceed.

Additional improvement: the diff only adds a changeset file and does not include test-file changes, so reviewers may need confirmation that coverage already exists or that tests were intentionally unnecessary.

Review PR #46217 against the repository contribution process. Confirm whether the author is part of the core team or whether this PR should be closed and re-routed through an issue-based agentic plan. If the code change is still desired, prepare a compliant follow-up PR from a core-team workflow and include or reference tests that validate the sync fs try/catch behavior.

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[gh-aw-bot]

@copilot please run the pr-finisher skill, and rerun checks once the branch is up to date.

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_{Comment /souschef to run again}