#1890 - feat(playwright): capture rendered DOM on non-2xx responses

[rzo1]

Add two opt-in configuration flags to the Playwright protocol so that Single-Page Applications which return a non-2xx stub document and then hydrate via JavaScript can be crawled correctly:

• playwright.capture.content.on.error: also capture page.content() when the origin response status is not 2xx (default false, preserves current behavior).
• playwright.override.status.on.content: when content was captured for a non-2xx response, report status 200 to downstream components and preserve the original status in the response metadata under playwright.origin.status (default false).

Document both flags in the module README and playwright-conf.yaml.

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