Release 5.0.0-pre.20210516.1 (2021-06-09)

Baseline: 275c54c

Cherry picks:

• 1f52e9a:
  Support rolling releases in Bazel release scripts.
• 2f72244:
  Fix syntax error in Bazel release scripts
• 4ef9c56:
  Fix location of -prerelease option
• cee8d3c:
  Release 5.0.0-pre.20210516.1 (2021-06-09)

This release contains contributions from many people at Google, as well as .

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