feat(python): Append OpenTelemetry propagators instead of replace

[mender]

DESCRIBE YOUR PR

According to documentation OpenTelemetry provides two default propagators: tracecontext,baggage. It may contain user defined propagators as well. Setting up SentryPropagator using set_global_textmap breaks down distributed tracing. It would be better to append propagator to existing ones instead of replace them.

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SLA

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• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

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[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[mender]

@antonpirker I believe it would be useful to integrate more smoothly with OpenTelemetry propagators. These changes will also enable us to use auto-instrumentation.