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test: stabilize <...>_sort_data_test::test_gc

This commit adds waiting for checkpoint GC results after
`box.snapshot()` in the `test_gc` test case in
`box-luatest/gh_10847_memtx_sort_data_test`. The checkpoint GC is
asynchronous.

I see less frequent `test_box_backup` failures of the same kind. I'll
let the test author to work on it: there are more checks there and I
don't want to break anything.

Statistics over three weeks of our CI logs (from 2026-09-08 to
2026-09-29, includes re-runs made by test-run itself):

| test case       | arm64 | x86_64 | overall |
| --------------- | ----- | ------ | ------- |
| test_gc         |    74 |    103 |     177 |
| test_box_backup |     8 |     18 |      26 |

My recipe to reproduce the instability locally:

```sh
$ ./test/test-run.py $(yes box-luatest/gh_10847_memtx_sort_data_test.lua | head -n 32)
```

NO_DOC=test adjustment
NO_CHANGELOG=same

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