[CLN] Remove redundant octree level resolution check in grid initialization

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Description

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Checklist

• My code uses type hinting for function and method arguments and return values.
• I have created tests which cover my code.
• The test code either 1. demonstrates at least one valuable use case (e.g. integration tests)
  or 2. verifies that outputs are as expected for given inputs (e.g. unit tests).
• New tests pass locally with my changes.

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• [CLN] Remove redundant octree level resolution check in grid initialization #1049 👈 (View in Graphite)
• [ENH/TEST] Add support for Greenstone model generation and corresponding test #1048
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