chore: Remove 27 truly unused test app view files

Removed unused test files from test/data/app/view/form/:
- 14 unused example files (example2, 3, 5, 6, 8-17)
- 4 old bug-fix test files (bug1535, 1585, 1598, 1637)
- 9 other unused form files (checkbox_array, empty_fill, form_with_buttons,
  names-sq-brackets, relative_siteroot, select_two_submits, submit_adjacentforms,
  submitform_ampersands, submitform_multiple)

Kept files that are actively used in acceptance and helper tests:
- bug1467 (used in within_test.js and session_test.js)
- complex, radio, image, index, unchecked (used in various helper tests)
- custom_locator_strategies (used in acceptance tests)

Verified by grepping all test files for references.

Author: kobenguyent