Stop collecting package versions

[alexmojaki]

A user report in https://pydanticlogfire.slack.com/archives/C06EDRBSAH3/p1724080095886999 revealed that the big logfire.package_versions resource attribute caused errors like the following when exporting metrics to Mimir (Prometheus):

Failed to export batch code: 400, reason:�received a series whose label value length exceeds the limit, label: 'logfire_package_versions', value: '{"Babel":"2.15.0","Deprecated":"1.2.14","Django":"5.1","Flask":"3.0.3","Jinja2":"3.1.4","Markdown":"3.6","MarkupSafe":"2.1.5","PyYAML":"6.0.2","Pygments":"2.18.0","SQLAlchemy":"2.0.32","Werkzeug":"3.0' (truncated) series: 'target_info{instance="362467f7ff7c489eba331bc7d4833c79", job="unknown_service", logfire_package_versions="{\"Babel\":\"2.15.0\",\"Deprecated\":\"1.2.14\",\"Django\":\"5.1\",\"Flask\":\"3.0.3\",\"Jinja' (err-mimir-label-value-too-long). To adjust the related per-tenant limit, configure -validation.max-length-label-value, or contact your service administrator.

Package versions have caused various problems, this was the final straw. Hopefully we can revive this feature in some smarter form in the future, but for now it seems best to just drop it entirely.

Internal discussion: https://pydantic.slack.com/archives/C05AF4A4WRM/p1724084380802899

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fe12714) to head (eb1e271).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage   100.00%   100.00%           
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  Files          124       124           
  Lines         9185      9178    -7     
  Branches      1196      1196           
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- Hits          9185      9178    -7     

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