docs(ci-insights): remove private beta access mention for CI Insights

[cursor]

Description

This PR removes the mention of private beta access for CI Insights since it is now in public beta.

Changes

• Removed the Early Access note from /src/content/docs/ci-insights.mdx (lines 24-28)
• The note previously stated that users needed to be part of the Early Access program and could apply for access
• CI Insights is now available as a public beta, so this restriction no longer applies

Impact

Users will no longer see the outdated information about needing to apply for early access to use CI Insights. They can now directly access CI Insights from their dashboard after enabling it through the GitHub Integration.

[mergify]

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