## Summary
Hashicorp Vault prefers a `LIST` HTTP method to be used when fetching
secrets but not all environments will allow custom http methods through
WAFs. This PR adds `N8N_EXTERNAL_SECRETS_PREFER_GET` which when set to
`true` will use GET instead of LIST to fetch secrets.
## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
Ensure all errors in `cli` are `ApplicationError` or children of it and
contain no variables in the message, to continue normalizing all the
errors we report to Sentry
Follow-up to: https://github.com/n8n-io/n8n/pull/7839
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