Add --active-last-2-months filter to environments command

[devin-ai-integration]

Add --active-last-2-months filter to environments command

Summary

Adds a new --active-last-2-months boolean filter flag to the shipyard get environments command that allows users to filter environments that have been active in the last 2 months, regardless of their current running status.

The implementation follows the exact same pattern as the existing --deleted flag:

• Flag definition with appropriate help text
• Viper binding in PreRun section
• Parameter processing that sends active_last_2_months=true as a query parameter to the API

Review & Testing Checklist for Human

• Verify backend API support: Confirm that the Shipyard API actually accepts and properly handles the active_last_2_months query parameter
• Test the flag functionality: Run shipyard get environments --active-last-2-months with real API credentials to ensure it works end-to-end
• Validate parameter naming: Double-check that the snake_case active_last_2_months API parameter name matches backend expectations

Notes

• The CLI builds successfully and shows the flag in help output
• All existing tests pass
• Implementation mirrors the --deleted flag pattern exactly
• No integration testing was possible without API credentials

Link to Devin run: https://app.devin.ai/sessions/4c531f3996bf46cbad874f8cab622413
Requested by: @bueller

[devin-ai-integration]

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[bueller]

this was a test pr trying out devin closing