Revert "[serverless] No-op AWS Lambda integration on missing API Key"

[duncanista]

Summary of changes

This reverts commit 8e63384.

Reason for change

It doesn't account for DD_API_KEY_SECRET_ARN or DD_KMS_API_KEY which is considered a regression.

Implementation details

n/a

Test coverage

Confirmed that it stops working for Lambdas with that configuration

Other details

[datadog-ddstaging]

Datadog Report

Branch report: jordan.gonzalez/revert/8e63384717cc1a2608815c661c13c65ed94ba965
Commit report: 6d7bddc
Test service: dd-trace-dotnet

✅ 0 Failed, 301275 Passed, 1616 Skipped, 11h 52m 6.39s Total Time

[andrewlock]

Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing the following branches/commits:

• This PR (5941)
• master

Execution-time benchmarks measure the whole time it takes to execute a program. And are intended to measure the one-off costs. Cases where the execution time results for the PR are worse than latest master results are shown in red. The following thresholds were used for comparing the execution times:

• Welch test with statistical test for significance of 5%
• Only results indicating a difference greater than 5% and 5 ms are considered.

Note that these results are based on a single point-in-time result for each branch. For full results, see the dashboard.

Graphs show the p99 interval based on the mean and StdDev of the test run, as well as the mean value of the run (shown as a diamond below the graph).