WIP Undici migration p2

[davidgamero]

node-fetch removals

• rips out node-fetch and @types/node-fetch, uses native fetch (undici) everywhere
• drops nock, migrates all test mocking to undici MockAgent
• rewrite health, log, watch to use fetch() + Readable.fromWeb() for streaming
• rename integration_test.ts → fullrequest_test.ts since it's a unit test

auth

• removes applyToFetchOptions from kubeconfig (dead after migration)
• cleans up dead tls config in applySecurityAuthentication (was set then immediately overwritten)

watch

• treat watch TimeoutError as reconnectable in informer, add exponential backoff on reconnect
• normalize timeout errors in watch.ts (fixes Node 23 mid-stream AbortError vs TimeoutError inconsistency)
• add integration test for watch

informer

• add informer reconnect integration test

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[cjihrig]

This is really great progress on modernizing the project. Thanks for working on it.

[davidgamero]

This is really great progress on modernizing the project. Thanks for working on it.

thanks! i was trying to remove nock so we can consolidate testing into undici mockagent and it snowballed