[Dev] Disable ep overlap memory optimization

[Wohox]

What does this PR do ?

This MR disables dgrad memory optimization for ep overlap in #2201 since it's causing nemo CI failure.

MR for main branch #2236

Contribution process

flowchart LR
    A[Pre-checks] --> B[PR Tests]
    subgraph Code Review/Approval
        C1[Expert Review] --> C2[Final Review]
    end
    B --> C1
    C2 --> D[Merge]

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• I have added relevant unit tests
• I have added relevant functional tests
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[Wohox]

/ok to test 3ec65c0

[Wohox]

/ok to test 1dc655d

[ko3n1g]

Ty!

[FDecaYed]

LGTM