dialects: (tensor) Incorrect default 'dynamic index' on insert_slice op

[n-io]

If the tensor.insert_slice op is set up with dynamic index, the default value should be DYNAMIC_INDEX.

This is required by mlir upstream. The default values in the static get method are currently set incorrectly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.86%. Comparing base (3543d82) to head (8ea5891).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2974   +/-   ##
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  Coverage   89.86%   89.86%           
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  Files         409      409           
  Lines       51085    51108   +23     
  Branches     7923     7925    +2     
=======================================
+ Hits        45905    45928   +23     
+ Misses       3926     3925    -1     
- Partials     1254     1255    +1     

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