ci: re-enable zebra & lightwalletd status checks

[gustavovalverde]

Motivation

We've recently disabled most lighwalletd CI tests for as required status checks, with recent changes on CI we should periodically check if this checks can be re-enabled, so we don't merge faulty code

Designs

Re-enable the following checks:

• Zebra checkpoint / Run sync-to-checkpoint test
• Zebra tip / Run full-sync-to-tip test
• lightwalletd tip / Run lwd-full-sync test
  • lightwalletd tip / Run lwd-grpc-wallet test
  • lightwalletd tip / Run lwd-send-transactions test
  • lightwalletd tip / Run lwd-update-sync test

These depend on PRs:

• fix(ci): actually create a cached state image after running a sync #4669
• fix(ci): Ignore lightwalletd hangs for now #4663
• maybe fix(sync): change default sync config to improve reliability #4670

Enable new checks:

• Rust doc ci(docs): test cargo doc warnings and errors #4635
• Build all crates individually (13 crate jobs + check matrix job) feat(ci): build each crate individually #4640
• Beta Rust fix(build): add beta rust to CI #4637
• cargo deny with --no-default-features and --all-features feat(ci): build each crate individually #4640

[teor2345]

I just re-enabled all these branch protection rules.