Fixes step-security#198

Add fine-grained permissions for GitHub tokens in multiple workflow files to enhance security by limiting access scope.

* **Documentation Update**
  - Add a section on using fine-grained permissions for GitHub tokens in `docs/Solutions/FixGITHUB_TOKENPermissions.md`.
  - Include an example of setting `permissions: contents: read` in a workflow file.
  - Mention the importance of the principle of least privilege.

* **Workflow Files Update**
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-network-filtering-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-file-monitor-with-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-file-monitor-without-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-https-monitoring-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-network-monitoring-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/hosted-network-without-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/arc-codecov-simulation.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/arc-secure-by-default.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/arc-solarwinds-simulation.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/arc-zero-effort-observability.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/baseline_checks.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/block-dns-exfiltration.yaml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/changed-files-vulnerability-with-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/changed-files-vulnerability-without-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/publish.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/self-hosted-file-monitor-with-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/self-hosted-network-filtering-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/self-hosted-network-monitoring-hr.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/unexpected-outbound-calls.yml`.
  - Add `permissions: contents: read` under the `on` section in `.github/workflows/anomalous-outbound-calls.yaml`.

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/step-security/github-actions-goat/issues/198?shareId=XXXX-XXXX-XXXX-XXXX).