Overestimates the intra R additions in polycyclic compounds?

[rwest]

This was an issue in ReactionMechanismGenerator/RMG-Java#299 :

RMG overestimates the intra R additions in polycyclic compounds.

For example, in the indenyl radical RMG tends to find a whole plethora of Intra_R_Add_Endo/Exocyclic reactions that should not be occuring due to the high strain in the transition state.

This is a reminder that we should look for it here, and implement a similar fix (or close this issue if for some reason it's not a problem)

[github-actions]

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