fix: preserve multi-digit GCP region numbers

[nawaaaaaAaar]

Fixes #1438.

Accept all digits in a GCP region number when extracting it from a zone. The current regex truncates europe-west12 to europe-west1, even though the shipped cloud-impact table has separate entries; this can select the wrong electricity carbon intensity.

Verification on Python 3.12.13:

• Eight new cases: four multi-digit regressions fail before the fix, four single-digit controls pass.
• Repository package test command: 688 passed, two skipped, three integration cases deselected, ten subtests passed.
• All applicable autoflake/isort/Black/flake8 pre-commit hooks passed.

No emissions factors were changed. Cloud metadata tests use mocked provider responses rather than a live GCP account; the package suite uses its existing hardware/API mocks. Web dashboard/API integration and the deliberately excluded visualization module were not exercised.

AI disclosure: autonomously reproduced, implemented, and tested using Perplexity Computer (GPT-6.1). No human review is claimed.

Combined with #1441 and #1443: package suite passed with 695 passes, two skips, three integration cases deselected and twelve subtests passed. PR is open and ready for review; hosted package tests, pre-commit, documentation, packaging and CodeQL require maintainer approval. The PR-size labeler passed but is not a code-verification result.

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[davidberenstein1957]

Looks right: [0-9] to [0-9]+ in geography.py is exactly what europe-west12-a needs, and the test covers it. Fixes #1438. The branch is behind master, a rebase before merge would be good.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.07%. Comparing base (7929a4f) to head (a89ef2c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1439   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          49       49           
  Lines        5199     5199           
=======================================
  Hits         4787     4787           
  Misses        412      412           

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