Remove error from tenancy.InitFromViper

[yurishkuro]

The function never returns an error, which makes it impossible to test for.

[codecov]

Codecov Report

Merging #3838 (a809faf) into main (97feed9) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3838      +/-   ##
==========================================
+ Coverage   97.58%   97.61%   +0.03%     
==========================================
  Files         291      291              
  Lines       16962    16955       -7     
==========================================
- Hits        16552    16551       -1     
+ Misses        323      319       -4     
+ Partials       87       85       -2     

Impacted Files	Coverage Δ
cmd/collector/app/flags/flags.go	100.00% <100.00%> (+3.19%)	⬆️
cmd/query/app/flags.go	100.00% <100.00%> (+4.61%)	⬆️
pkg/tenancy/flags.go	100.00% <100.00%> (ø)
cmd/collector/app/sampling/gprc_handler.go
cmd/collector/app/sampling/grpc_handler.go	100.00% <0.00%> (ø)

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