Fix layout transformer for FusedConv (#24169)
### Description
Fix layout transformer for FusedConv.
The current layout transformer will transform `FusedConv` (kMSDomain)
into `FusedConv` (kMSInternalNHWCDomain) if the EP wants channels_last.
However, kMSInternalNHWCDomain uses OpType `Conv` for both Conv and
FusedConv, so `FusedConv` (kMSInternalNHWCDomain) is invalid
(unregistered op).
This PR fixes this and allows layout transformer change `FusedConv`
(kMSDomain) into `Conv` (kMSInternalNHWCDomain).
### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
