chore(warehouse): allow empty properties schema for event models

[Jayachand]

Description

Empty schema is allowed in json schema obtained from event models

Notion Ticket

https://www.notion.so/rudderstacks/Spreadsheet-Show-all-events-from-event-models-irrespective-of-no-properties-10c9bb3afe4e4340b1a0bf95c10e154e?pvs=4

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 47.70% and project coverage change: +0.15 🎉

Comparison is base (f2e99c7) 53.62% compared to head (2465bbc) 53.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3095      +/-   ##
==========================================
+ Coverage   53.62%   53.78%   +0.15%     
==========================================
  Files         347      348       +1     
  Lines       53806    53847      +41     
==========================================
+ Hits        28853    28960     +107     
+ Misses      23320    23248      -72     
- Partials     1633     1639       +6     

Impacted Files	Coverage Δ
event-schema/event_schema_api.go	0.00% <0.00%> (ø)
warehouse/identity/identity.go	0.51% <0.00%> (ø)
warehouse/slave.go	1.05% <0.00%> (ø)
warehouse/utils/utils.go	72.93% <ø> (-0.12%)	⬇️
warehouse/warehouse.go	11.59% <0.00%> (-0.19%)	⬇️
warehouse/encoding/csvloader.go	80.00% <50.00%> (ø)
warehouse/encoding/jsonloader.go	83.72% <73.68%> (ø)
warehouse/encoding/jsonreader.go	70.00% <77.77%> (ø)
warehouse/internal/repo/upload.go	83.36% <82.35%> (-0.04%)	⬇️
runner/runner.go	69.88% <100.00%> (+0.11%)	⬆️
... and 7 more

... and 7 files with indirect coverage changes

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