Allow states other than unassinged at shipment creation

[harsimranmaan]

Addresses bigpanther/shipanther#299

[codecov-commenter]

Codecov Report

Merging #120 (8b64a1c) into main (8827c49) will decrease coverage by 0.04%.
The diff coverage is 71.64%.

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
- Coverage   62.76%   62.72%   -0.05%     
==========================================
  Files          34       34              
  Lines        1762     1811      +49     
==========================================
+ Hits         1106     1136      +30     
- Misses        515      528      +13     
- Partials      141      147       +6     

Impacted Files	Coverage Δ
actions/shipments.go	61.05% <25.00%> (-1.37%)	⬇️
actions/orders.go	69.36% <71.73%> (-0.34%)	⬇️
actions/carriers.go	59.45% <100.00%> (ø)
actions/customers.go	65.34% <100.00%> (ø)
actions/tenants.go	54.45% <100.00%> (ø)
actions/terminals.go	66.33% <100.00%> (ø)
actions/users.go	70.19% <100.00%> (ø)
models/order.go	100.00% <100.00%> (ø)

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