Fix CUDA mem leak in GFTT and move CUDA malloc out of critical path

[kevinchristensen1]

Fixes #3042, also mentioned in #2868
Also added a fix for #3194
Fixes cuda mem leak in GoodFeaturesToTrackDetector and moves cuda malloc/free into the ctor/dtor, out of critical path

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• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
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  Patch to opencv_extra has the same branch name.
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[asmorkalov]

👍 LGTM.

[kevinchristensen1]

Thanks for reviewing Alex! It looks like the macOS-ARM64 CI build is failing due to a timeout issue unrelated to this patch. Is there anything else I need to do?