Remove ops from decompositions where converters exist

[HolyWu]

Description

The last removed aten.var_mean doesn't have a converter, but it's a duplicate in the list, so I remove it as well.

Partially #2665

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project (You can use the linters)
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• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests to verify my fix or my feature
• [ ] New and existing unit tests pass locally with my changes
• [ ] I have added the relevant labels to my PR in so that relevant reviewers are notified

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[apbose]

Thanks for pointing this out and the above changes! Couple of points-

1. grid_sampler_2d would require some additional changes
2. As pointed out by you (thanks!), upsample cases do not seem to be direct enough. But removal of the above decomposition should be good for now.

[apbose]

Looks good to me, pending on CI