Various Renovate improvements

[mthalman]

• Updates the pipeline templates to support repos which aren't onboarded to Arcade. This allows them to reference the arcade repo as a pipeline resource. This will cause the job to clone the repo to gain access to the various artifacts that need to be referenced.
• Update the Renovate job to show steps as yellow if the Renovate log has any warnings.
• Update to the base configuration of the renovate.json file in the documentation to disable vulnerability alerts. The token used by the Renovate bot would require vulnerability alert permission which we should avoid adding. Disabling vulnerability alerts in renovate.json file prevents a warning message in the log file indicating that it doesn't have permission to read vulnerability data. Unfortunately, this needs to be defined in each Renovate config file, not centrally in the Arcade infra because there's no environment variable support for this setting.
• Update the Renovate config to allow any post-upgrade task command to be used. This allows consuming repos to use whatever commands they need in post-upgrade tasks.
• Updated documentation with new troubleshooting info.