Replace python script with tracegen

[albertteoh]

Which problem is this PR solving?

• Resolves [spm] Change README to use tracegen #4503

Description of the changes

• Replaces the python example with tracegen in order to reduce maintenance needed on the script.

How was this change tested?

• Ran locally E2E to confirm traces and metrics are appearing in Jaeger UI.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
  - [] I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

Patch has no changes to coverable lines.

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[albertteoh]

Let me know if there's a preference to use the latest tag.

[yurishkuro]

you can also remove the respective section in .github/dependabot.yml

[albertteoh]

Note that I've also removed this as we're executing tracegen in the same monitor_backend network. Tested this locally to make sure:

# Fail to access the port from host machine.
$ telnet localhost 4317
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

# Successfully write to port from docker command.
$ docker run --env OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="http://otel_collector:4317" \
  --network monitor_backend \
  --rm \
  jaegertracing/jaeger-tracegen:1.49 \
    -trace-exporter otlp-grpc \
    -traces 1
...
2023-09-12T20:40:01.903Z	LEVEL(-8)	global/internal_logging.go:62	exporting spans	{"count": 2, "total_dropped": 0}

[albertteoh]

you can also remove the respective section in .github/dependabot.yml

Nice, thanks. Removed in: b850f02