fix(playwright): ensure engine knows when tracing is enabled #2533
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Description
Fix for #2529
Before #2418, Playwright tracing only worked with OTeL, but now it can work with other reports that use OTeL behind the scenes.
We now check for a
OTEL_TRACING_ENABLED
variable set by the otel reporter instead, which should be in control of whether tracing is needed (which also reduces the coupling between the PW engine and publish-metrics).Testing
Tested locally and with Fargate. Automated tests for this as not very easy (as it depends on platform integrations), so can be added separately.
Pre-merge checklist