2.20.0

• apps/postgresql: Receiver Enhancements (Metric Additions) (#804)
• makefile: add build target (#845)
• Internal: add support for testing oracledb (#834)
• Update otel to v0.59.1. (#825)
• [integration_test/postgres/sles] Modify sles 15 install (#836)
• kokoro: install go 1.19 for tests (#835)
• tomcat: add description back for user field (#833)
• confgenerator: use golden package in unit tests (#811)
• Rename makefile, improve tooling (#815)
• Internal: Remove dead code from 3p apps test (#826)
• Bump version to 2.20.0 to accommodate the multiline support feature. (#828)
• Add temporary workaround for breakage caused by systemd update. (#827)
• Add dev doc for using Windows custom vm images (#813)
• Remove deprecated and no longer available opensuse-leap-15-2. (#824)
• Grab labels of pull request (#818)
• Testing: refer to image_lists.presubmit (#762)
• Internal: remove deprecated distro "stretch" (#784)
• Internal: remove all mentions of debian-9 (#786)
• Python Golang Multiline Exception Detection Using Combined Parser (#776)
• update mongodb supported_app_version (#820)
• Fix: MinimumSupportedAgentVersion presubmit equality (#819)
• Bump recommended version for mongodb to 2.19.0 (#817)
• Bump VERSION to 2.19.1. (#814)
• Add Github presubmit check for minimum_supported_agent_version author (#775)
• Upgrade Go to version 1.19 (#808)