refactor: funnel event creation through room versions

[kegsay]

In preparation of interfacing up the room version value.

[devonh]

looks good

[codecov]

Codecov Report

Patch coverage: 30.00% and project coverage change: -0.11 ⚠️

Comparison is base (72285b2) 66.60% compared to head (9449b93) 66.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3060      +/-   ##
==========================================
- Coverage   66.60%   66.50%   -0.11%     
==========================================
  Files         495      495              
  Lines       53489    53489              
==========================================
- Hits        35626    35571      -55     
- Misses      14209    14247      +38     
- Partials     3654     3671      +17     

Flag	Coverage Δ
unittests	47.07% <30.00%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
federationapi/internal/perform.go	49.00% <0.00%> (-0.34%)	⬇️
federationapi/routing/invite.go	45.69% <0.00%> (-1.33%)	⬇️
federationapi/routing/join.go	54.81% <0.00%> (-0.54%)	⬇️
federationapi/routing/leave.go	44.72% <0.00%> (-0.85%)	⬇️
federationapi/routing/threepid.go	0.00% <0.00%> (ø)
roomserver/internal/input/input_missing.go	68.27% <0.00%> (-0.16%)	⬇️
roomserver/storage/shared/storage.go	67.77% <50.00%> (-0.81%)	⬇️
internal/transactionrequest.go	74.77% <100.00%> (ø)
roomserver/internal/helpers/helpers.go	67.46% <100.00%> (ø)
...oomserver/storage/postgres/state_snapshot_table.go	68.04% <100.00%> (-3.10%)	⬇️

... and 15 files with indirect coverage changes

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