fix: standardize terminology in database models

Jakku Amruthrequested to merge
recovery into main
  • Fixed variable names with spaces in Cohort, College, Task, and TaskProgress models
  • Replaced 'AI Developer Intern' with 'AIDeveloperIntern' throughout
  • Replaced 'Tech Lead' with 'TechLead' throughout
  • Fixed method names like getAIDeveloperInternProgress, calculateAIDeveloperInternStats
  • Ensures consistent naming convention across all models

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