Release v12.0.2

• fix(payroll-entry): show make bank entry button when manually submitting salary slip (#18498)
• fix: added payroll period in HR module (#18500)
• fixed test cases and the logic for pro rata calculation
• fix: Pro rata calculation is not working for WDV depreciation method
• fix: Fixes in stock ageing report
• fix: Use get_serial_no and remove batch
• fix: Remove batch
• fix: Consider serial no and batches in Stock ageing report
• fix: Enhancement in stock ageing report
• fix: Changed columns to new dict form
• perf(tests): Remove unnecessary tearDown code
• perf(travis): Use setUpClass instead of setUp
• fix(stock): Fix travis builds
• perf(tests): Use country with lesser fixtures
• perf(tests): Do not unnecessarily create companies
• perf(tests): Use setUpClass and tearDownClass instead of setUp and tearDown
• fix(travis): Install wkhtmltopdf
• fix(travis): Remove redundant arguments
• fix(travis): Use --site parameter
• fix(travis): Merge install and before_script
• fix(travis): Execute get-app before bench start
• perf(travis): Use travis optimizations
• perf(travis): Do not build assets
• perf(travis): Remove unnecessary processes from Procfile
• fix(travis): Use MariaDB credentials from site_config.json
• perf(travis): Do not waste 10 seconds
• fix(travis): Execute get-app and reinstall after bench start
• fix(travis): Do not disable scheduler using CLI
• fix(travis): Do not use use_site
• fix(travis): Setup MariaDB
• fix(travis): Remove unused files
• fix(travis): Remove travis/bench_init.sh
• fix(travis): Do not execute install.py
• fix(travis): Install coverall after tests
• fix(travis): Use MariaDB 10.3
• fix(travis): Restructure build matrix
• fix(travis): Remove unnecessary commands