fix: don't ignore stats middleware template path calculation

[atzoum]

Description

Fixing a bug where the retrieved RouteMatch template was ignored. Additionally, added the response's status code in the measurement's tags.

Note: added a test to verify correct behaviour

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

Base: 44.00% // Head: 44.00% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (136a635) compared to base (09dba21).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 136a635 differs from pull request most recent head c75a034. Consider uploading reports for the commit c75a034 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2594   +/-   ##
=======================================
  Coverage   44.00%   44.00%           
=======================================
  Files         187      187           
  Lines       39086    39101   +15     
=======================================
+ Hits        17198    17208   +10     
- Misses      20807    20813    +6     
+ Partials     1081     1080    -1     

Impacted Files	Coverage Δ
middleware/middleware.go	24.13% <0.00%> (-8.43%)	⬇️
warehouse/schema.go	47.82% <0.00%> (-1.16%)	⬇️
enterprise/reporting/reporting.go	9.77% <0.00%> (+1.43%)	⬆️
services/stats/stats.go	90.30% <0.00%> (+1.81%)	⬆️
config/backend-config/namespace_config.go	73.95% <0.00%> (+3.12%)	⬆️
enterprise/reporting/setup.go	52.38% <0.00%> (+14.28%)	⬆️

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