Fix #78929: plus signs in cookie values are converted to spaces

We switch the cookie value parsing function from `php_url_decode()` to
`php_raw_url_decode()`, so that cookie values are n

Fix #78929: plus signs in cookie values are converted to spaces

We switch the cookie value parsing function from `php_url_decode()` to
`php_raw_url_decode()`, so that cookie values are now parsed according
to RFC 6265, section 4.1.1. We also refactor to remove duplicate code
without changing the execution flow.

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