chore: remove abort-controller dependency

[gameroman]

What/Why/How?

abort-controller dependency was only used in one test file and AbortController is available natively since Node 14.17.0

Reference

https://replacements.fyi/abort-controller

https://developer.mozilla.org/en-US/docs/Web/API/AbortController

Testing

Tests pass

Screenshots (optional)

Check yourself

• This PR follows the contributing guide
• All new/updated code is covered by tests
• Core code changed? - Tested with other Redocly products (internal contributions only)
• New package installed? - Tested in different environments (browser/node)
• Documentation update has been considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9ee14bc

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[DmitryAnansky]

@gameroman
Thank you for your contribution—we really appreciate it!