Fix HTTP instrumentations to set proper span status

[pellared]

Fix the otelhttp, otelgin, otelmacaron, otelrestful middlewares
by using SpanKindServer when deciding the SpanStatus.
This makes 4xx response codes not to be an error anymore.

Similar PRs #1848, #1973

[codecov]

Codecov Report

Merging #2427 (8b14968) into main (f2c368a) will increase coverage by 0.0%.
The diff coverage is 100.0%.

❗ Current head 8b14968 differs from pull request most recent head 2679054. Consider uploading reports for the commit 2679054 to get more accurate results

@@          Coverage Diff          @@
##            main   #2427   +/-   ##
=====================================
  Coverage   74.2%   74.3%           
=====================================
  Files        144     144           
  Lines       6563    6563           
=====================================
+ Hits        4874    4877    +3     
+ Misses      1546    1543    -3     
  Partials     143     143           

Impacted Files	Coverage Δ
...hub.com/emicklei/go-restful/otelrestful/restful.go	100.0% <100.0%> (ø)
...ation/github.com/gin-gonic/gin/otelgin/gintrace.go	80.7% <100.0%> (ø)
...ntation/gopkg.in/macaron.v1/otelmacaron/macaron.go	91.8% <100.0%> (ø)
instrumentation/net/http/otelhttp/handler.go	81.0% <100.0%> (+1.8%)	⬆️