Migrate locker and info-needed-closer workflows to vscode-azuretools reusable templates

[Copilot]

Replaces the legacy vscode-github-triage-actions bot-based workflow implementations with the reusable workflow templates from microsoft/vscode-azuretools.

Changes

• info-needed-closer.yml: Replace checkout + npm install + bot action steps with uses: microsoft/vscode-azuretools/.github/workflows/info-needed-closer.yml@main; add required issues: write and contents: read permissions
• locker.yml: Same migration to uses: microsoft/vscode-azuretools/.github/workflows/locker.yml@main; add required issues: write permission

Both workflows retain their existing schedule and workflow_dispatch triggers. Default values from the reusable templates are used without override.

jobs:
  main:
    uses: microsoft/vscode-azuretools/.github/workflows/locker.yml@main

Original prompt

Please update the "locker" and "needs-more-info-closer" GitHub Actions workflows to use the reusable templates at https://github.com/microsoft/vscode-azuretools/blob/main/.github/workflows/info-needed-closer.yml and https://github.com/microsoft/vscode-azuretools/blob/main/.github/workflows/locker.yml. If the action does not appear to exist, do not create it. If neither action exists, do nothing. If you end up making changes, please create a pull request.

The default values defined in the reusable templates are fine and do not need to be overridden in these calling workflows.

The needs-more-info workflow requires issues: write and contents: read permissions. The locker workflow requires only issues: write permission.

Copilot Code Review may indicate that you should not use the main branch as the source, instead pinning to a specific commit--please disregard that and use main.

Use this PR as a reference for how to do it correctly: microsoft/vscode-containers#420

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