dd-trace cleanup

[amancevice]

What does this PR do?

• upgrade deprecated GitHub action versions for actions/checkout and actions/setup-node
• add default task for Rakefile (:test task)
• update gemspec to use datadog gem ~> 2.0
• update logging references to "dd-trace" to "datadog"
• remove :span_type from tracer options
• set log level on init instead of on-demand

Motivation

current version isn't compatible with datadog gem (v2)

Testing Guidelines

bundle exec rake test

Additional Notes

N/A

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog