fix: await post.populate() in test to prevent dangling promise on Node 18

[Copilot]

The CI job "Node 18 MongoDB 7.0.7 OS ubuntu-22.04" on the 7.x branch fails with a 2000ms timeout in the beforeEach hook for the "using multiple populate calls" test. Two bugs in 7.x's test/util.js are the primary root causes (both already fixed on master via f40ce4555):

1. clearTestData — missing return after the first successful dropDatabase() causes the DB to be dropped up to 5× per test. By the 4th test, 15+ sequential drops cause MongoDB 7.0.7 to respond slowly enough that the next User.create() exceeds the Mocha timeout.
2. stopRemainingOps — sets buffer=true on collections but doesn't remove them from db.collections cache, so freshly registered models in the next beforeEach may inherit a buffered collection.

To fully fix the 7.x CI, the test/util.js changes from master need to be backported to 7.x.

Changes

• test/document.populate.test.js: Add await to the previously fire-and-forget post.populate(param) call in "using multiple populate calls". Without await, a dangling Promise is left in-flight when clearTestData drops the DB, which can produce an unhandled rejection and leaves a permanently buffered operation stuck in the collection queue.

// Before — unawaited, leaves a pending populate when DB is dropped
post.populate(param);

// After — awaited, cleans up before test teardown
await post.populate(param);

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Pull request overview

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