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The first COPY generates about 230 MB of write I/O, but the second COPY, after deleting most of the rows and vacuuming the rows away, generates 370 MB of writes. Both COPYs insert the same amount of data, so they should generate roughly the same amount of I/O. This commit doesn't try to fix the issue, just adds a test case to demonstrate it. Add a new 'checkpoint' command to the pageserver API. Previously, we've used 'do_gc' for that, but many tests, including this new one, really only want to perform a checkpoint and don't care about GC. For now, I only used the command in the new test, though, and didn't convert any existing tests to use it.