Don't remove sector data when moving data into a shared path

[magik6k]

Fixes #7484

Example of what could happen:

• Worker A has access to paths 1 and 2
• Worker B has access to path 1
• Some sector is stored in path 2
• Worker B wants that data moved to path 1:
  • (in most cases worker A should do the move locally, but there are some edge-cases here)
  • Worker B fetches the sector from A/2
  • B stores that data in path 1
  • Worker B tells Worker A to remove its copies of that sector
  • Worker A looks for it's copies of that sector, and removes it from both paths since it happens to have access to both

[codecov]

Codecov Report

Merging #7494 (f352c18) into master (3a3edbb) will decrease coverage by 0.00%.
The diff coverage is 47.09%.

@@            Coverage Diff             @@
##           master    #7494      +/-   ##
==========================================
- Coverage   39.88%   39.88%   -0.01%     
==========================================
  Files         631      632       +1     
  Lines       66907    66918      +11     
==========================================
+ Hits        26684    26688       +4     
+ Misses      35607    35606       -1     
- Partials     4616     4624       +8     

Impacted Files	Coverage Δ
extern/sector-storage/manager.go	64.94% <0.00%> (ø)
extern/sector-storage/stores/http_handler.go	73.59% <0.00%> (ø)
extern/sector-storage/stores/index.go	73.44% <ø> (+1.65%)	⬆️
extern/sector-storage/worker_local.go	62.08% <0.00%> (ø)
extern/sector-storage/stores/mocks/index.go	16.48% <14.28%> (ø)
extern/sector-storage/stores/mocks/store.go	27.58% <27.58%> (ø)
extern/sector-storage/stores/remote.go	58.35% <53.84%> (-0.03%)	⬇️
extern/sector-storage/stores/local.go	59.26% <100.00%> (+0.46%)	⬆️
extern/sector-storage/stores/mocks/pf.go	100.00% <100.00%> (ø)
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
... and 24 more

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[neondragon]

This appears to have successfully prevented the problem reoccurring.

[Aloxaf]

This PR seems also fix #5996 and #6121?

[RobQuistNL]

And it fixes #7545