[WIP] Update project_users to use title from position data

[Copilot]

• Explore codebase to understand position and title usage
• Create migration to copy position enum values to title (where title is nil)
• Update model to remove position enum
• Update views that reference position to use title
• Update models that query by position value
• Update controllers that permit position parameter
• Update factories to use title instead of position
• Update tests to remove position enum expectations
• Run tests to verify changes
• Run linting to ensure code quality

Original prompt

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This section details on the original issue you should resolve

<issue_title>Convert position data to title data</issue_title>
<issue_description>Stakeholders are no longer using Position data for project_users -- they're allowing free text for a title within external filemakerpro db

• Update project_users.title to project_users.position value (using enum) wherever title is nil
• Drop position column
• Remove enum from project_user.rb</issue_description>

<agent_instructions>write code to complete this story.

some additional details to the description: production has job title data in project_users.position.

write code to migrate the existing data into the project_users.title field, drop the column, and remove the enum since it's now a free-text field.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Convert position data to title data #432

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