Turn IResultCapture::{push,pop}*Message into free functions

The thread-safety changes in assertions & messages turned the message
stacks into thread-local state, instead of it being member of `RunContext`.
The relevant {push,pop}(Un)ScopedMessage functions were turned from member
functions into static functions, but this left `catch_message.hpp` with
dependency on `IResultCapture`'s definition for the functions, and thus
it still had to include `catch_interfaces_capture.hpp`.

With this change, `catch_message.hpp` no longer needs
`catch_interfaces_capture.hpp`.

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