fix: context cancelled/deadline exceeded errors coming back internal

[markphelps]

Fixes: #1801

• checks for context.Canceled and context.DeadlineExceeded errors and returns proper GRPC code instead of Internal
• moves ErrorUnaryInterceptor up the chain so its before any of our other custom middleware
• Swaps out deprecated WithUnaryServerChain from grpc_middleware package to grpc.ChainUnaryInterceptor. The former just called the latter anyways

TODO

• I want to check that our Interceptor ordering logic is correct and that the ErrorInterceptor is always the outer most

[codecov]

Codecov Report

Merging #1803 (d3f7d80) into main (3bf3255) will decrease coverage by 0.13%.
The diff coverage is 38.88%.

@@            Coverage Diff             @@
##             main    #1803      +/-   ##
==========================================
- Coverage   70.41%   70.28%   -0.13%     
==========================================
  Files          58       58              
  Lines        5550     5563      +13     
==========================================
+ Hits         3908     3910       +2     
- Misses       1419     1427       +8     
- Partials      223      226       +3     

Impacted Files	Coverage Δ
internal/cmd/grpc.go	0.00% <0.00%> (ø)
internal/server/auth/middleware.go	90.80% <11.11%> (-9.20%)	⬇️
internal/server/middleware/grpc/middleware.go	69.96% <100.00%> (+1.81%)	⬆️

... and 1 file with indirect coverage changes

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[GeorgeMac]

Looks good. We could always setup whipt against it with a low timeout.