test(general): Fix upgrade portion of robustness test

[chaitalisg]

Moved the upgrade repository function used in the robustness test to snapmeta package. This gets rid of the poison blob error the test hit earlier this month.

The root cause of the error was separate kopia.config used by the restore operation and upgrade operation. With this change, all operations in the test use the same kopia.config.

[codecov]

Codecov Report

Merging #2337 (88ecfec) into master (07ec981) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2337      +/-   ##
==========================================
- Coverage   74.32%   74.23%   -0.09%     
==========================================
  Files         429      434       +5     
  Lines       33519    34087     +568     
==========================================
+ Hits        24914    25306     +392     
- Misses       6760     6925     +165     
- Partials     1845     1856      +11     

Impacted Files	Coverage Δ
cli/command_repository_upgrade.go	64.48% <0.00%> (-6.31%)	⬇️
repo/blob/throttling/throttling_semaphore.go	97.05% <0.00%> (-2.95%)	⬇️
snapshot/snapshotfs/repofs.go	79.29% <0.00%> (-1.52%)	⬇️
repo/initialize.go	74.61% <0.00%> (-1.46%)	⬇️
cli/command_repository_status.go	78.94% <0.00%> (-1.44%)	⬇️
internal/server/source_manager.go	80.51% <0.00%> (-0.63%)	⬇️
cli/observability_flags.go	77.16% <0.00%> (-0.62%)	⬇️
repo/open.go	75.08% <0.00%> (ø)
repo/content/info.go	87.50% <0.00%> (ø)
repo/object/objectid.go	88.88% <0.00%> (ø)
... and 36 more

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[adowair]

Looks good for the most part, two questions