Fix tests

[mcocdawc]

Description

Fixes the testsuite.
Before it failed when doing

pip install .
pytest

only an editable install, i.e.

pip install -e .
pytest

worked.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.57%. Comparing base (ee199f1) to head (376e10f).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop      #15       +/-   ##
============================================
+ Coverage    61.33%   99.57%   +38.23%     
============================================
  Files           24       11       -13     
  Lines         1239      467      -772     
============================================
- Hits           760      465      -295     
+ Misses         479        2      -477     

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[Copilot]

Pull request overview

This PR aims to make the test suite pass when running against a non-editable installation (pip install . followed by pytest), by adjusting import behavior and pytest collection settings.

Changes:

• Switched some intra-package imports from relative to absolute earthkit.time.* imports.
• Updated pytest configuration to only collect tests from tests/ (no longer from src/).
• Disabled --doctest-modules in the default pytest options.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/earthkit/time/sequence.py	Changes calendar import to an absolute earthkit.time.* import.
src/earthkit/time/climatology.py	Changes imports of sequence/utilities to absolute earthkit.time.* imports.
pyproject.toml	Alters pytest collection (removes src from testpaths) and disables doctest execution.

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