Zebra v1.0.0-alpha.5

Zebra's latest alpha checkpoints on Canopy activation, continues our work on NU5, and fixes a security issue.

Some notable changes include:

Added

• Log address book metrics when PeerSet or CandidateSet don't have many peers (#1906)
• Document test coverage workflow (#1919)
• Add a final job to CI, so we can easily require all the CI jobs to pass (#1927)

Changed

• Zebra has moved its mandatory checkpoint from Sapling to Canopy (#1898, #1926)
  • This is a breaking change for users that depend on the exact height of the mandatory checkpoint.

Fixed

• tower-batch: wake waiting workers on close to avoid hangs (#1908)
• Assert that pre-Canopy blocks use checkpointing (#1909)
• Fix CI disk space usage by disabling incremental compilation in coverage builds (#1923)

Security

• Stop relying on unchecked length fields when preallocating vectors (#1925)