[configuration] Reactify study entity forms

[Montekkundan]

Brief summary of changes

• Replaces the Cohort and Project Smarty forms with TypeScript React pages.
• Preserves the existing form fields, validation, Save and Reset behavior, and guarded update endpoints.
• Keeps project cohort affiliations and edited tab headings synchronized.
• Fixes recruitment target type handling when updating projects.
• Adds translation template entries and integration coverage.
• Removes the retired Smarty templates and jQuery form scripts.
• Keeps generated JavaScript bundles ignored.

Testing instructions

• Sign in as a user
• Open http://localhost:8080/configuration/cohort/.
• Create and edit a cohort, then confirm its name, options, and recruitment target save correctly.
• Confirm Reset restores the form values and invalid recruitment targets show an error.
• Open http://localhost:8080/configuration/project/.
• Create and edit a project, including its affiliated cohorts.
• Confirm the project tab updates immediately and the changes persist after reloading.
• Confirm missing names, missing aliases, invalid recruitment targets, and aliases longer than four characters show validation errors.
• Run target=configuration npm run compile.

Link(s) to related issue(s)

• Resolves [configuration] Reactify Study Entities #10817