fix runtime error: comparing uncomparable type

[ktalg]

Fixes a runtime panic that occurs when KeepAlive is called with a Context implemented by an uncomparable type, which is later canceled. The panic message is:

panic: runtime error: comparing uncomparable type lease_test.uncomparableCtx

goroutine 380 [running]:
go.etcd.io/etcd/client/v3.(*lessor).keepAliveCtxCloser(0xc000327720, {0x13416c8, 0xc00011b9b0}, 0x14c4932ade455905, 0xc002291420)
    /home/kevin/IdeaProjects/etcd/client/v3/lease.go:351 +0x1d6
created by go.etcd.io/etcd/client/v3.(*lessor).KeepAlive in goroutine 156
    /home/kevin/IdeaProjects/etcd/client/v3/lease.go:299 +0x554

To reproduce the issue, the existing test has been updated to include a custom uncomparable Context implementation. Previously, this test consistently caused a panic due to the uncomparable Context type. The updated implementation modifies keepAliveCtxCloser to properly handle such cases.

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This pull-request has been approved by: ktalg
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