Fix bootstrap.js crash from premature @actions/core static import

[Copilot]

All four bootstrap.js files gained a top-level import * as core from '@actions/core' to enable richer error logging. Since node_modules is installed at runtime (via npm ci), Node.js fails to resolve this ESM static import before any bootstrap logic runs, crashing the action immediately.

Changes

• Dynamic import instead of static: Replace import * as core from '@actions/core' with const core = await import('@actions/core') as the first statement in the finally block, where node_modules is guaranteed to exist
• npm ci failure path: console.error is used here since @actions/core is unavailable when installation itself fails; core.setFailed() is preserved for the npm run build failure path where node_modules is present
• Formatting: Applied consistent style from the originating PR ({spawn}, single-param arrow functions, trailing commas)

// Before — crashes on load when node_modules doesn't exist
import * as core from '@actions/core'

// After — deferred until node_modules is confirmed present
} finally {
  const core = await import('@actions/core')
  // core.setFailed / core.info now safe to call

Original prompt

Fix the failing GitHub Actions workflow Test (sites/site-with-errors)
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 64748466050
Job URL: https://github.com/github/accessibility-scanner/actions/runs/22370677159/job/64748466050

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