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fix(browserless): handle the rejection of an unused browser context (#1028)

createContext opens its first browser context eagerly. In connect mode a
credentialed proxyServer makes that promise reject with a TypeError, and a
context that is never used left the rejection unhandled, crashing processes
running with the default --unhandled-rejections=throw.

newBrowserContext now attaches a no-op handler to every context promise it
creates (the eager one and the one a retry swaps in), so the error still
reaches the first call that awaits the context.

Closes #1019

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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