Revert "#13405: TTNN implementation of LENET model (#13473)"

[tt-rkim]

This reverts commit 82eb413.

Ticket

Some non det issue nightly ttnn/models

Problem description

there's some weird interplay between tests that causes this.

What's changed

Revert and let model writers know.

Checklist

• Post commit CI passes
• Blackhole Post commit (if applicable)
• Model regression CI testing passes (if applicable)
• Device performance regression CI testing passes (if applicable)
• (For models and ops writers) Full new models tests passes
• New/Existing tests provide coverage for changes