refactor: consolidate geometry assertions and improve test robustness…

[kashi-verma]

… in TestDPM

Refactor geometry assertions into a private helper method _assert_geometry.

Fix off-by-one error in test_get_apparent_wind loop.

Update floating-point assertions to use pytest.approx for clearer intent.

Standardize string formatting to f-strings across the test suite.

Related Issue / Discussion:

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Fixes Issue #XX

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Changes:

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• Modified class / file / …

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• have (already previously) filled the 52North Contributor License Agreement and received positive feedback on this matter
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• provide unit tests embedded in the WRT test framework (WeatherRoutingTool/tests) that allow the simple testing of the new/modified functionalities. All (previous and new) unit tests execute without new error messages.
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[kdemmich]

Hi @kashi-verma , thank you for your PR. We appreciate the time and effort that was put into it but, unfortunately, you did not fill important section of our PR template. We will not evaluate PRs that do not follow our PR template.