feat: enhance GenerateTranscriptForm and GenerateResultAPI to include detailed batch information and dynamic filename generation for downloads

[vikrantwiz02]

This pull request enhances the batch and grade export APIs in the examination module to provide more detailed and context-aware information. The main improvements include enriching batch data returned by the API and generating more descriptive filenames for exported grade spreadsheets.

API Response Enhancements:

• The batch list in the API response now includes separate fields for name, discipline (with a normalized format combining acronym and specialization if present), and year, in addition to the existing label.

Export Functionality Improvements:

• The filename for the exported student grades spreadsheet is now dynamically generated to include the program, discipline (with specialization if available), semester, and academic year, making it more descriptive and easier to identify.
• The Content-Disposition header for the download response uses the new dynamic filename, and the Access-Control-Expose-Headers header is set to allow client-side access to the filename in CORS scenarios.