Show that `expNegInvGlue` is not analytic at `0`

[mcdoll]

The function expNegInvGlue is the prototypical example of a smooth, but non-analytic function.
We are missing the fact that it is not analytic at 0. This follows almost directly from expNegInvGlue.zero_iff_nonpos.

[alreadydone]

Something like AnalyticOnNhd.eqOn_zero_of_preconnected_of_frequently_eq_zero should work