feat: make defer configurable

[Noroth]

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• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• If applicable, I have provided instructions for reviewers for manually validating my changes.
• Documentation has been updated on https://github.com/wundergraph/docs-website.
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[github-actions]

Router-nonroot image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-c741ca149973e1f38b11e7a3a9875fc24b7d1b38-nonroot

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.26%. Comparing base (ebdd13a) to head (bb281f8).

Additional details and impacted files

@@                         Coverage Diff                         @@
##           feat/eng-7770-add-defer-support    #3002      +/-   ##
===================================================================
- Coverage                            40.72%   40.26%   -0.46%     
===================================================================
  Files                                  244      244              
  Lines                                29593    29598       +5     
===================================================================
- Hits                                 12053    11919     -134     
- Misses                               16193    16319     +126     
- Partials                              1347     1360      +13     

Files with missing lines	Coverage Δ
router/core/graph_server.go	67.30% <100.00%> (-1.19%)	⬇️
router/core/operation_processor.go	65.86% <100.00%> (-4.08%)	⬇️
router/pkg/config/config.go	20.83% <ø> (-2.09%)	⬇️

... and 15 files with indirect coverage changes

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