Functionality to remove duplicate vertices and update
other vertex attributes and triangle indices is implemented.
The C++ and python tests are also written to test the code.

On branch sganjugu/remdup2
Changes to be committed:
modified:   cpp/open3d/t/geometry/TriangleMesh.cpp
modified:   cpp/open3d/t/geometry/TriangleMesh.h
modified:   cpp/pybind/t/geometry/trianglemesh.cpp
modified:   cpp/tests/t/geometry/TriangleMesh.cpp
modified:   python/test/t/geometry/test_trianglemesh.py

Previously, I was doing a manual copy and shrinking the vertices.
Instead in this checkin all vertex attributes, including the
coordinates are shrunk using IndexGet method using a vertex mask.

Further, the triangle index remapping is similar to what was done
earlier, with some simplications. One thing to note, is that
we cannot use utility::InclusivePrefixSum to remap vertex indices
because the duplicates can occur in any position and may be duplicates
of any earlier vertex.

For e.g., suppose there were 9 vertices to start with, and 8th (index 7, starting from 0),
was a duplicate of 2nd (index 1, starting from 0).

So, the vertex mask would look like this:
Vertex indices: [0, 1, 2, 3, 4, 5, 6, 7, 8]
Vertex mask:    [1, 1, 1, 1, 1, 1, 1, 0, 1]
Prefix sum:   [0, 1, 2, 3, 4, 5, 6, 7, 7, 8]
This gives an incorrect index map for 8th vertex, which is mapped to
index 7 instead of 1.

On branch sganjugu/remdup2
Your branch is up to date with 'origin/sganjugu/remdup2'.
Changes to be committed:
modified:   ../cpp/open3d/t/geometry/TriangleMesh.cpp
modified:   ../python/test/t/geometry/test_trianglemesh.py

* Fix .desktop entry when installing in a UNIX system

* Fix the path to the default Open3D application when installing to a custom path.

* Update CHANGELOG.md for PR#6599

---------

Co-authored-by: Ewing Kang <ewing_kang@glorymakeup.com>

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.2 to 3.1.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@3.1.2...3.1.3)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

- Made vertex mask type bool.
- Check if mesh has triangle indices before getting them.
- Modified some errors to warnings.

On branch sganjugu/remdup2
Your branch is up to date with 'origin/sganjugu/remdup2'.
Changes to be committed:
modified:   cpp/open3d/t/geometry/TriangleMesh.cpp

Instead of using if statements explicitly, used DISPATCH_FLOAT_INT_DTYPE_TO_TEMPLATE
to dispatch to RemoveDuplicateVerticesWorker function appropriately.

On branch sganjugu/remdup2
Your branch is up to date with 'origin/sganjugu/remdup2'.
Changes to be committed:
modified:   ../cpp/open3d/t/geometry/TriangleMesh.cpp

…o sganjugu/flyingobject2

…o sganjugu/flyingobject2