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Remove all feature.textproto files and references.

 * (D) **/feature.textproto
  - remove feature.textproto since these files are no longer being
    maintained. the README.md for each test case defines the paths
    that are expected to be supported.
 * (M) proto/feature.proto
  - remove all fields other than the feature profile ID that is
    used elsewhere.
 * (D) tools/validate_paths.go
  - remove util that checks contents of feature.textproto.