fix: drop deprecated node-fetch package

[GordonSmith]

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Testing:

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Pull request overview

This pull request removes the deprecated node-fetch (v3.3.2) and abort-controller (v3.0.0) packages from the @hpcc-js/comms package, updating the codebase to rely on native Node.js >= v18 implementations of fetch and AbortController. The change simplifies the dependency tree and modernizes the package for current Node.js versions.

Key changes:

• Removed polyfill-based implementations in favor of native Node.js APIs
• Added comprehensive test coverage for AbortController functionality
• Cleaned up package-lock.json to remove deprecated dependencies and their transitive dependencies

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
packages/comms/tests/abortController.spec.ts	New test file adding comprehensive coverage for AbortController functionality with various scenarios (immediate abort, delayed abort, multiple requests, GET/POST methods)
packages/comms/src/index.node.ts	Removed conditional polyfill imports for node-fetch and abort-controller, now assumes native Node.js >= v18 APIs are available
packages/comms/package.json	Removed node-fetch and abort-controller from dependencies
package-lock.json	Cleaned up dependency tree removing node-fetch, abort-controller, and their transitive dependencies (fetch-blob, formdata-polyfill, node-domexception, web-streams-polyfill, and various whatwg-url/webidl-conversions versions)

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