move amp test and change op support to warning

[szha]

Description

move amp test to follow naming convention for contrib features and change op support to warning

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage:
• Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

• move test_amp to test_contrib_amp to follow the naming convention
• change op support to warning instead of test failure.

[marcoabreu]

I'd like to wait for the result of the discussion on dev@ first

[szha]

@marcoabreu I intended to wait until the discussion concludes too. Also, I'd like to remind you that vetos must be accompanied by technical justification https://www.apache.org/foundation/voting.html#Veto.

[abhinavs95]

@mxnet-label-bot add [Test]

non-technical

[szha]

https://lists.apache.org/thread.html/6c2c1d365eccf4cf9baa86ceba72b5aa034b12951b5bc19afd425f20@%3Cdev.mxnet.apache.org%3E

[szha]

met with @ptrendx today and we are proceeding with warning now.