Updated donation checkout request handling

[9larsons]

no ref

Aligns donation checkout session creation with the site's donation settings so the API path enforces the same enabled/disabled state already reflected in public settings and Portal.

• routes donation checkout creation through the existing donations-enabled check
• adds unit coverage for the disabled-donations path

[coderabbitai]

Walkthrough

This PR changes the precondition for donation checkout in RouterController._createDonationCheckoutSession from checking Stripe configuration to checking whether donations are enabled via areDonationsEnabled(). When donations are disabled, the method throws DisabledFeatureError. The test suite is updated to stub the new areDonationsEnabled method and includes a new test case verifying that checkout fails with the appropriate error when donations are not enabled.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Updated donation checkout request handling' directly describes the main change: modifying how donation checkout session creation is handled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining the alignment of donation checkout session creation with site donation settings.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-donation-checkout-handling

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