Hotfix add all locations to colorbar label

[cvanelteren]

Addresses #294

[codecov]

Codecov Report

Attention: Patch coverage is 92.04545% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ultraplot/axes/base.py	81.57%	3 Missing and 4 partials ⚠️

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[Copilot]

Pull Request Overview

This PR addresses issue #294 by ensuring that the colorbar label placement accommodates all valid location combinations. Key changes include:

• Adding parameterized tests in ultraplot/tests/test_colorbar.py to verify label placement across various combinations.
• Refactoring the label placement logic in ultraplot/axes/base.py using helper functions for improved clarity and maintainability.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ultraplot/tests/test_colorbar.py	Added new tests to cover diverse colorbar and label positions.
ultraplot/axes/base.py	Refactored the colorbar label placement logic with helper functions.

[beckermr]

The tests need work.