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GH-36933: [Python] Pointless ellipsis in array repr (#37168)

### Rationale for this change

Explained in the issue

### What changes are included in this PR?

Added a check when adding ellipsis to see if the ellipsis is meaningful.
Rewrite some of tests affected by this change.

### Are these changes tested?

Yes

### Are there any user-facing changes?

Yes, if the window = 2 and the array is [1, 2, 3, 4, 5], its print will be [1, 2, 3, 4, 5] instead of [1, 2, ..., 4, 5]

* Closes: #36933

Authored-by: Ray Zhang <m@raycursive.com>
Signed-off-by: David Li <li.davidm96@gmail.com>