fix(query): skip fetch when infinite query trigger is called with skipToken

[xianjianlf2]

Problem

When an infinite query hook is skipped (via skipToken or the skip option), calling fetchNextPage()/fetchPreviousPage() (or the lazy trigger) dispatched initiate(skipToken), which fired a real request using skipToken as the query arg and created a bogus cache entry.

Fix

Guard the shared infinite-query trigger so that when it is called with a skipped arg (skipToken), it unsubscribes any previous promise and bails out without dispatching, matching the auto-subscription behavior. This makes fetchNextPage()/fetchPreviousPage() on a skipped hook a no-op instead of firing a request with skipToken as the query arg.

if (arg === skipToken) {
  unsubscribePromiseRef(promiseRef)
  promiseRef.current = undefined
  return promiseRef.current as unknown as InfiniteQueryActionCreatorResult<any>
}

Testing

Added a test in packages/toolkit/src/query/tests/buildHooks.test.tsx verifying that triggering fetchNextPage()/fetchPreviousPage() on a skipped infinite query does not dispatch a request or create a cache entry.

Closes #5028

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commit: bfdfcce

[xianjianlf2]

Note on the two red Test Types: TS next checks: they fail identically on upstream master — run 29339252283 (commit 58e8cfe, before this PR's CI run) shows the same 5 errors with typescript@7.1.0-dev.20260714.1: buildHooks.ts(1859) TS2769 and the mapBuilders.test-d.ts TS2578/TS2769 set. This PR doesn't touch either location (its only src change is around line 2103), so the failures are nightly-TypeScript breakage unrelated to this change.