fix: MongoDB cursor leak

[bstasyszyn]

Close various DB iterators after use.

[codecov]

Codecov Report

Patch coverage: 85.29% and no project coverage change.

Comparison is base (0ab7a12) 88.22% compared to head (dbf7bc9) 88.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1544   +/-   ##
=======================================
  Coverage   88.22%   88.22%           
=======================================
  Files         226      226           
  Lines       21087    21108   +21     
=======================================
+ Hits        18603    18623   +20     
- Misses       1589     1591    +2     
+ Partials      895      894    -1     

Impacted Files	Coverage Δ
pkg/store/store.go	96.59% <0.00%> (-2.02%)	⬇️
pkg/activitypub/store/ariesstore/ariesstore.go	88.57% <85.71%> (+0.33%)	⬆️
pkg/activitypub/service/acceptlist/acceptlist.go	88.79% <100.00%> (+0.09%)	⬆️
...ctivitypub/service/activityhandler/inboxhandler.go	83.60% <100.00%> (+0.02%)	⬆️
...vitypub/service/anchorsynctask/activitysynctask.go	88.48% <100.00%> (+0.06%)	⬆️
pkg/activitypub/service/outbox/outbox.go	91.09% <100.00%> (+0.02%)	⬆️
...owedorigins/allowedoriginsmgr/allowedoriginsmgr.go	100.00% <100.00%> (ø)
pkg/anchor/linkstore/linkstore.go	94.93% <100.00%> (+0.06%)	⬆️
pkg/nodeinfo/service.go	91.80% <100.00%> (+1.48%)	⬆️
pkg/store/anchorstatus/store.go	89.52% <100.00%> (+0.16%)	⬆️
... and 6 more

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