feat: add NID to logs in courier

[CaptainStandby]

Added message_nid field to logs from courier

Related issue(s)

https://github.com/ory-corp/cloud/issues/3509

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

[codecov]

Codecov Report

Merging #2956 (4e5dcd0) into master (4e5dcd0) will not change coverage.
The diff coverage is n/a.

❗ Current head 4e5dcd0 differs from pull request most recent head 0ee8c8b. Consider uploading reports for the commit 0ee8c8b to get more accurate results

@@           Coverage Diff           @@
##           master    #2956   +/-   ##
=======================================
  Coverage   76.19%   76.19%           
=======================================
  Files         309      309           
  Lines       19069    19069           
=======================================
  Hits        14529    14529           
  Misses       3410     3410           
  Partials     1130     1130           

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