Jsonrpc: defend against very large stderr lines

In https://github.com/joaotavora/rassumfrassum/issues/1 we found
a language server that emits very large single-line messages
(5MB): that eventually end up in Eglot's stderr.  With the
output arriving in chunks into the stderr buffer, this creates a
significant slowdown of '[stderr] nil' lines, which eventually
clogs up the stdout JSONRPC communication.

This fix exits the `jsonrpc--forwarding-buffer` function early
if the forward-line call didn't actually move to a new line.

* lisp/jsonrpc.el (jsonrpc--forwarding-buffer): Fix.
(Version): Bump to 1.0.27.

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