Add new tests for dpnp.einsum and adopt it with NumPy-2.0.0 (#2012)

* update docstring

* add new tests

* update tests

* address comment

* align the code with NumPy 1.26

* use formatted string for Error msg 75bb4e7

.buildinfo

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             Data Parallel Extension for NumPy
           </a>
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@@ -1108,14 +1108,14 @@ <h1>Source code for dpnp.dpnp_array</h1><div class="highlight"><pre>
 <span class="sd">            Read the elements using this index order, and place the elements</span>
 <span class="sd">            into the reshaped array using this index order.</span>
 
-<span class="sd">                - &quot;C&quot; means to read / write the elements using C-like index</span>
+<span class="sd">                - ``&quot;C&quot;`` means to read / write the elements using C-like index</span>
 <span class="sd">                  order, with the last axis index changing fastest, back to the</span>
 <span class="sd">                  first axis index changing slowest.</span>
-<span class="sd">                - &quot;F&quot; means to read / write the elements using Fortran-like</span>
+<span class="sd">                - ``&quot;F&quot;`` means to read / write the elements using Fortran-like</span>
 <span class="sd">                  index order, with the first index changing fastest, and the</span>
 <span class="sd">                  last index changing slowest.</span>
 
-<span class="sd">            The default is ``&quot;C&quot;``.</span>
+<span class="sd">            Default: ``&quot;C&quot;``.</span>
 
 <span class="sd">        Returns</span>
 <span class="sd">        -------</span>

_modules/dpnp/dpnp_flatiter.html

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_modules/dpnp/dpnp_iface.html

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             Data Parallel Extension for NumPy
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