Upgrade OTel SDK dependencies in the internal/example module

[gdfast]

Problem
The example code has a number of dependencies on otel packages that are either deprecated or very old. This makes developing and improving the examples challenging, and also doesn't make for the best examples for new users.

Solution

• Upgrade the OTel packages to v1.24.0 (the latest version)
• Remove old and deprecated dependent modules where possible

[tigrannajaryan]

Thank you @gdfast

If you haven't already please also run go mod tidy in the example directory.

[tigrannajaryan]

@arminru we have a codecov report failing with some message about keys. I remember you were doing something with tokens a few days ago.

Can this be the reason it fails? https://github.com/open-telemetry/opamp-go/actions/runs/8349792083/job/22871138122?pr=264

[arminru]

@tigrannajaryan the token should be available via the org secret already but the workflow probably needs to be configured to actually use it. The action might also need an update at some point.

https://docs.codecov.com/docs/adding-the-codecov-token

[arminru]

@tigrannajaryan I just checked the workflow yaml and it's already set up correctly. The token itself was the problem, seems like the repo had its own invalid or expired token configured locally that was overriding the org secret. I deleted it, now it should work.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.70%. Comparing base (ba70a24) to head (e9ba9f0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
- Coverage   74.83%   74.70%   -0.13%     
==========================================
  Files          25       25              
  Lines        1625     1625              
==========================================
- Hits         1216     1214       -2     
- Misses        297      299       +2     
  Partials      112      112              

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[tigrannajaryan]

Great, thanks @arminru !

[gdfast]

Thank you @gdfast

If you haven't already please also run go mod tidy in the example directory.

✔️ I did this before pushing