runtime: corrupted GoroutineProfile stack traces [1.23 backport]

[gopherbot]

@prattmic requested issue #69243 to be considered for backport to the next 1.23 minor release.

@gopherbot Please backport to 1.23. This is a regression in goroutine profiles with no workaround.

[cherrymui]

@felixge would you like to create cherry-pick CLs for this? Or let me know and I can create them. Thanks.

[gopherbot]

Change https://go.dev/cl/621277 mentions this issue: [release-branch.go1.23] runtime: fix GoroutineProfile stacks not getting null terminated

[felixge]

@cherrymui I've tried to create the cherry-pick CLs for this issue as well as #69865 (still needs approval) based on the wiki instructions. But this is the first time I've created a cherry-pick CL for a minor Go release, so PTAL to make sure I got it right.

[gopherbot]

Closed by merging CL 621277 (commit 35c010a) to release-branch.go1.23.