tor-circmgr: Make a fraction of preemptive HS circuits be STUB+.

gabi-250requested to merge
gabi-250/arti:launch-stub-circuits into main

NOTE: This is stacked on top of !2101 (merged)

Previously, launch_hs_circuits_as_needed would only launch STUB circuits. Now, a fraction of the launched circuits are STUB+.

Closes #1353 (closed)

Edited by gabi-250

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