Fix potential crashes and unhandled exceptions in cli utility helpers (Batch 8)

[Ra229287]

This PR fixes bugs #261 to #265.

Packet

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    "title": "Potential unhandled crashes in cli utility helpers (Batch 8)",
    "actual_behavior": "Various CLI parameters, environment definitions, and helper outputs crashed with raw tracebacks when variables did not conform to expected formats.",
    "expected_behavior": "All helper functions should gracefully check parameter structures and parameter types, falling back to safe defaults without tracebacks.",
    "repro_steps": [
      "Pass invalid types to truthy_env",
      "Pass invalid types to requirement_line_is_pinned",
      "Pass invalid types to package_dependency_spec_is_commit_pinned",
      "Pass invalid types to requirement_line_needs_hash",
      "Pass invalid types to _has_endpoint_space_or_control"
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    "affected_workflow": "CLI Utility life-cycle"
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