[Error Counting] Use Builder for all router::Response Creation

[rregitsky]

This converts all use of constructors to build router::Response objects into builders. This is done to force as many constructions as possible to go through new(), where we will later be adding errors to the response context so we can count them in the Telemetry plugin (handled in a later PR).

Part 1 of a split from #7357.

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Checklist

Complete the checklist (and note appropriate exceptions) before the PR is marked ready-for-review.

• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Metrics and logs are added³ and documented
• Tests added and passing⁴
  • Unit Tests
  • Integration Tests
  • Manual Tests

Exceptions

Note any exceptions here

Notes

Footnotes

1. It may be appropriate to bring upcoming changes to the attention of other (impacted) groups. Please endeavour to do this before seeking PR approval. The mechanism for doing this will vary considerably, so use your judgement as to how and when to do this. ↩

2. Configuration is an important part of many changes. Where applicable please try to document configuration examples. ↩

3. A lot of (if not most) features benefit from built-in observability and debug-level logs. Please read this guidance on metrics best-practices. ↩

4. Tick whichever testing boxes are applicable. If you are adding Manual Tests, please document the manual testing (extensively) in the Exceptions. ↩

[github-actions]

@rregitsky, please consider creating a changeset entry in /.changesets/. These instructions describe the process and tooling.

[apollo-librarian]

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File Changes

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* (developer-tools)/apollo-mcp-server/(latest)/command-reference.mdx
* (developer-tools)/apollo-mcp-server/(latest)/guides/index.mdx

Build ID: 24993a8ec9f4a4c9d686d186

URL: https://www.apollographql.com/docs/deploy-preview/24993a8ec9f4a4c9d686d186