fix(router): fix unmarshall error of mapper.json during config fetch

[dkorittki]

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• I have discussed my proposed changes in an issue and have received approval to proceed.
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[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat/split-configs@1ae7d2e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...g/controlplane/configpoller/split_config_poller.go	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             feat/split-configs    #2842   +/-   ##
=====================================================
  Coverage                      ?   41.01%           
=====================================================
  Files                         ?      992           
  Lines                         ?   124532           
  Branches                      ?     5666           
=====================================================
  Hits                          ?    51076           
  Misses                        ?    71745           
  Partials                      ?     1711           

Files with missing lines	Coverage Δ
router/gen/proto/wg/cosmo/node/v1/node.pb.go	29.74% <ø> (ø)
router/pkg/routerconfig/cdn/split_fetcher.go	86.55% <100.00%> (ø)
...g/controlplane/configpoller/split_config_poller.go	83.09% <90.90%> (ø)

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[github-actions]

Router-nonroot image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-7b050a10b44ea435a76ab953c2caf3ed576bc3e9-nonroot

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