What does this PR do?

Omit creating cold start tracing on LMI

Motivation

We want to provide a better experience when a new sandbox is initialized and the gap between invocation and init is quite long, and SVLS-8483

Testing Guidelines

Unit tests

Additional Notes

Doesn't affect metrics

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
• This PR passes the integration tests (ask a Datadog member to run the tests)