Release 5.0.0-pre.20210824.2 (2021-08-27)

Baseline: 19ae197

Cherry picks:

• 18bfed2:
  Properly preserve state when interrupted during a deletion. Also
  use best Bazel practices for reinitializing maps by reassigning,
  since just clearing can retain memory. When enqueuing deleted
  nodes, don't use more threads than there are nodes. Finally, fix
  a test accidentally changed in
  3ea75594bfdb5e67942501
  55995c45a5adc00c28.
• 8c3a1a6:
  Release 5.0.0-pre.20210824.2 (2021-08-27)

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