perf: revert to use the light safe stringify for is-error (#86053)
`is-error` is a helper that being used accorss client and server now, in
#84909 we switched the underlying safe stringify error implementation to
the precompiled dependency `safe-stable-stringify`. But it increased the
client bundle size a bit.
The change in #84909 was only for applying the `safe-stable-stringify`
for client file logger with mcp, not really necessary need to change for
is-error helper
Note: Save minified around 12kb. it's actually 7.5kb on bundlephobia,
but because we're using ncc to compile it to cjs dependency that the
size seems slightly larger than their metrics. The saved gzip size would
be around 2-3.x kb
next.js
00cb5d99 - perf: revert to use the light safe stringify for is-error (#86053)
