Use Go 1.20 errors.Join instead of go.uber.org/multierr

[mx-psi]

Go 1.20 includes new builtin error joining support that can replace the usage of go.uber.org/multierr. We should switch to using these and ban the usage of go.uber.org/multierr via depguard (same as this).

This is blocked by #8207

[shivanshuraj1333]

@mx-psi kindly assign this one as well

[bogdandrutu]

@mx-psi can you document why we stopped this effort until better understand the performance issue.

[mx-psi]

I removed the good first issue and easy labels and added on hold instead.

The 'easy' way to change the code to use errors.Join means creating a slice of errors, which in the common case will all be nil, and then joining that slice. multierr.Append instead avoids this by checking if the error is nil before adding to the internal slice, which is more performant.

We can still use errors.Join and avoid this by checking that the errors are not nil before appending to the slice, but it leads to more verbose code.