feat(codegen): add AbortSignal and per-request headers to NodeHttpAdapter

[pyramation]

feat(codegen): add AbortSignal and per-request headers to NodeHttpAdapter

Summary

Adds two capabilities to NodeHttpAdapter in the codegen node-fetch.ts template that were present in the old browserCompatible=false implementation but missing from the current adapter:

1. AbortSignal support — callers can cancel in-flight node:http requests (important for CLI Ctrl+C and React Query component unmount).
2. Per-request header overrides — callers can pass one-off headers to a single execute() call without mutating the adapter instance.

Both are exposed via a new optional NodeHttpExecuteOptions parameter on execute(). The base GraphQLAdapter interface is not changed — the extra optional parameter is backward-compatible.

Changes are confined to a single template file (node-fetch.ts) that is copied verbatim into generated output at codegen time.

Review & Testing Checklist for Human

• Verify execute() signature stays compatible with GraphQLAdapter interface — the third optional param should not break assignability, but confirm TypeScript is happy in a generated project that uses NodeHttpAdapter as a GraphQLAdapter.
• Verify AbortSignal cleanup — on normal completion, req.on('close') removes the abort listener. On abort, req.destroy() triggers close which also cleans up. Confirm no leak path exists (e.g., if the promise rejects before the request is created).
• Test with a real codegen run — since this is a template file excluded from TS compilation, the only way to validate types is to run codegen and compile the output. Generate a project with nodeHttpAdapter: true and verify the output compiles and the new options work at runtime.

Notes

• The template file (node-fetch.ts) is excluded from the codegen package's own tsconfig.json, so package-level tsc will not catch type errors in this file.
• Caller sites (executor-generator, ORM index) do not yet pass these new options through — they remain available for direct usage of NodeHttpAdapter by consuming applications.
• ESLint config in the codegen package appears to be broken pre-existing (missing eslint.config.js for ESLint v9); unrelated to this change.

Link to Devin run: https://app.devin.ai/sessions/73d9c02182a240e3857850d776bad754
Requested by: @pyramation

[devin-ai-integration]

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