Fix data race in SSLCertContext copy & assignment#13227
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Resolve concurrent read/write data races by using std::scoped_lock in operator= and locking other.ctx_mutex at the start of the copy constructor.
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Resolve concurrent read/write data races by using std::scoped_lock in operator= and locking other.ctx_mutex at the start of the copy constructor.
Replaced the manual lock definition and sequence with std::scoped_lock
Pushed lock guard to beginning to avoid source mutation during read to avoid data race by threads
ISSUE #13225