[AIG]: remove beta badges from the ai gateway logs

[danielgek]

Summary

Remove beta badges from AI Gateway docs

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Removed beta badges from the AI Gateway documentation to reflect the stable status of the features.

• Removed beta badges from the AI Gateway logs documentation
• Updated the logging and logpush sections to remove references to beta status
• Ensured compliance with the documentation style guide

Modified Files

• src/content/docs/ai-gateway/observability/logging/index.mdx
• src/content/docs/ai-gateway/observability/logging/logpush.mdx

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