Disable profiling when run in AWS Lambda.

[purple4reina]

What does this PR do?

When aws lambda runtime is detected, refuse to start profiler.

Motivation

Profiling is not currently supported in aws lambda. Node and Python are currently in public beta. Because Go is not included in this, customers would get charged for profiles that are potentially inaccurate.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.

For Datadog employees:

• If this PR touches code that handles credentials of any kind, such as Datadog API keys, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[nsrip-dd]

Thanks! I left a suggestion for how to structure this, mainly just prefer to make this package testable without having to inspect/modify private package variables where we can.

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-09-13 20:39:47

Comparing candidate commit d83b09f in PR branch rey.abolofia/lambda-profile with baseline commit f8a0ac2 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 40 metrics, 1 unstable metrics.

[nsrip-dd]

Thanks!