drop redundant TARGETS files that duplicate sister BUCK files

Summary:
Initial chunk of fbcode/executorch TARGETS->BUCK migration. Removes 40
TARGETS files where:

  - 7 are byte-identical to their sister BUCK file, OR
  - 33 contain only a no-arg `define_common_targets()` call matching
    a sister BUCK that also calls `define_common_targets()` with no args

In both cases fbcode falls through to the BUCK file (via
`name_v2 = TARGETS,BUCK`) and evaluates the exact same content it did
before. Any TARGETS that passes any argument to define_common_targets
(positional or keyword) is intentionally excluded — those are the
`is_fbcode = True` cases that need a separate, more careful treatment.

Differential Revision: D109082060

Author: bigfootjon