fix: remove redundant abort controller

[achingbrain]

The signal from this abort controller replaces any user-supplied signal in forward operations.

When the user supplied signal aborts we call abort on the abort controller, aborting it's signal.

We do not call .abort() on the abort controller for any other reason, therefore it can be removed and the user-supplied abort signal can be passed through unmodified.

The redundant abort controller's signal also has the default limit on the number of event listeners so it causes "possible EventEmitter memory leak detected" warnings in node which people frequently mistake for an error and file issues about.

This manifests itself in helia-http-gateway as:

(node:58297) MaxListenersExceededWarning: Possible EventTarget memory leak detected. 11 abort listeners added to [AbortSignal]. Use events.setMaxListeners() to increase limit
    at [kNewListener] (node:internal/event_target:572:17)
    at [kNewListener] (node:internal/abort_controller:241:24)
    at EventTarget.addEventListener (node:internal/event_target:685:23)
    at anySignal (file:///Users/alex/Documents/Workspaces/ipfs/helia-http-gateway-sessions/node_modules/any-signal/dist/src/index.js:21:20)
    at raceBlockRetrievers (file:///Users/alex/Documents/Workspaces/ipfs/helia-http-gateway-sessions/node_modules/@helia/utils/dist/src/utils/networked-storage.js:187:20)
    at NetworkedStorage.get (file:///Users/alex/Documents/Workspaces/ipfs/helia-http-gateway-sessions/node_modules/@helia/utils/dist/src/utils/networked-storage.js:87:33)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async BlockStorage.get (file:///Users/alex/Documents/Workspaces/ipfs/helia-http-gateway-sessions/node_modules/@helia/utils/dist/src/storage.js:68:20)
    at async file:///Users/alex/Documents/Workspaces/ipfs/helia-http-gateway-sessions/node_modules/ipfs-unixfs-exporter/dist/src/resolvers/unixfs-v1/content/file.js:60:27

Change checklist

• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation if necessary (this includes comments as well)
• [ ] I have added tests that prove my fix is effective or that my feature works

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:tada: This PR is included in version 1.3.5 :tada:

The release is available on npm package (@latest dist-tag)

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:tada: This PR is included in version 1.13.0 :tada:

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:tada: This PR is included in version 1.0.0 :tada:

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