ref(agents-insights): Remove feature flag registrations

[ArthurKnaus]

• closes TET-1228: Remove agent and mcp monitoring feature flags
• requires ref(mcp-insights): Remove feature flag #101110

[linear]

TET-1228 Remove agent and mcp monitoring feature flags

[seer-by-sentry]

Potential bug: Removing the organizations:mcp-insights feature flag registration will cause all frontend checks to fail, making the entire MCP feature set inaccessible.

• Description: The removal of the organizations:mcp-insights feature flag registration will cause all frontend checks for this flag, such as in the hasMCPInsightsFeature function, to consistently return false. This will make the MCP module invisible in the Insights UI, block access to the main MCP overview page by rendering a NoAccess component, and prevent MCP-specific details from appearing in trace views. The cumulative effect is that the entire MCP feature set will become inaccessible to all users, which is contrary to the presumed intent of graduating the feature.

• Suggested fix: To correctly graduate the feature, all frontend code that checks for the mcp-insights flag should be updated. This includes removing the checks from components like McpInsightsFeature, functions like hasMCPInsightsFeature, and dependency maps like MODULE_FEATURE_VISIBLE_MAP. The code should be modified to make MCP features unconditionally available before the flag registration is removed.
  _{severity: 0.85, confidence: 0.95}

_{Did we get this right? 👍 / 👎 to inform future reviews.}