chore: improve bootstrap format/lint to support multiple packages

[spalladino]

Summary

• Allow specifying multiple packages to format/lint: yarn format pkg1 pkg2 pkg3
• Proper argument parsing with while loop (flags can be in any position)
• Validate that specified packages exist before running
• Run lint with parallel -j 50% to avoid overwhelming the system

Usage Examples

# Format multiple packages
yarn format stdlib foundation

# Lint multiple packages  
yarn lint archiver sequencer

# Check formatting on specific packages
yarn format --check stdlib pxe

# Flags can be in any position
yarn lint sequencer --check archiver

Test plan

• Run yarn format stdlib - should format only stdlib
• Run yarn format stdlib foundation - should format both
• Run yarn format nonexistent - should error with "Package 'nonexistent' not found"
• Run yarn lint --check - should check all packages

🤖 Generated with Claude Code

[AztecBot]

Flakey Tests

🤖 says: This CI run detected 1 tests that failed, but were tolerated due to a .test_patterns.yml entry.

\033FLAKED\033 (8;;http://ci.aztec-labs.com/c23f087a7ff06b79�c23f087a7ff06b798;;�):  yarn-project/end-to-end/scripts/run_test.sh simple src/e2e_p2p/valid_epoch_pruned_slash.test.ts (396s) (code: 1) group:e2e-p2p-epoch-flakes (\033Santiago Palladino\033: chore: improve bootstrap format/lint to support multiple packages (#19907))