pdn should error if a macro is failing to connect

[maliberty]

Describe the bug

If a macro is short enough to fall between two pdn strips then an error should be reported (or the algorithm improved to handle it).

Expected Behavior

A PDN error rather than a PSM one.

Environment

See below

To Reproduce

ng45/bp when run with
ORFS 9d638a1
OR e49038b

(eg Jenkins OpenROAD-flow-scripts-Nightly-Public/3090)

Relevant log output

From https://jenkins.openroad.tools/job/OpenROAD-flow-scripts-Nightly-Public/3090/execution/node/842/log/

[WARNING PSM-0038] Unconnected PDN node on net VDD at location (27.485um, 322.455um), layer: metal5.
[ERROR PSM-0078] IR drop setup failed.  Analysis can't proceed.

Screenshots

Additional Context

No response

[rovinski]

I will throw out there that it can be useful to ignore these errors when prototyping. It would be nice to have an option to ignore a hypothetical error during the PDN stage or have it be automatically fixed with a healing strap or similar.