Add error handling to nginx export

[johngodley]

Add error support to nginx export output.

[Copilot]

Pull request overview

This PR adds support for exporting “error” actions to Nginx configuration output, generating location blocks and return <code>; directives so error-based redirects can be represented in the Nginx export format.

Changes:

• Add Nginx export support for action_type === 'error' by emitting location blocks with return <status>;.
• Update conditional (agent/referrer) export paths to emit either return (for errors) or rewrite (for URL actions) via a shared helper.
• Add integration tests validating exact vs encoded locations and regex/case-insensitive location generation for error actions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/integration/import-export/test-nginx.php	Adds integration tests covering Nginx export output for error actions (exact, encoded, case-insensitive, regex).
includes/import-export/format/class-nginx.php	Implements error-action handling in the Nginx exporter, including location-line generation and conditional action output.

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