Remove elastictranscoder examples following the deprecation of the service

[kdaily]

Issue #, if available:

Replaces #9946

Description of changes:

After the merge of boto/botocore#3614, we can remove the examples here as the client will no longer be functional.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.39%. Comparing base (68039fa) to head (c4681b5).
⚠️ Report is 490 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9952      +/-   ##
===========================================
- Coverage    93.40%   93.39%   -0.02%     
===========================================
  Files          211      210       -1     
  Lines        17012    17052      +40     
===========================================
+ Hits         15890    15925      +35     
- Misses        1122     1127       +5     

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