CommitDiff: remove deprecated field `ignore_whitespace_change`

Arunrequested to merge
arkn98/gitaly:remove-ignore-whitespace-change-field into master

ignore_whitespace_change field was deprecated in favor of the enum WhitespaceChanges behind a feature flag add_ignore_all_white_spaces in [1] and [2]. The feature flag was removed subsequently in [3]. This commit removes the deprecated field.

  1. !5288 (merged)
  2. gitlab!111055 (merged)
  3. gitlab!123726 (merged)

Fixes: #4764 (closed)

Edited by Arun

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