Add global quotas and quota usage support for OBJ services

[zliang-akamai]

📝 Description

Add support for OBJ quota and global quota udpates.

✔️ How to Test

pytest test/integration/models/object_storage/test_obj_quotas.py -v

make test-unit

[Copilot]

Pull request overview

Adds client-side support for Object Storage global (account-level) quotas and enriches existing Object Storage quota models with quota type and usage support metadata, along with corresponding unit/integration tests and fixtures.

Changes:

• Add ObjectStorageGlobalQuota model with a usage() helper for global quota usage retrieval.
• Expose quota_type and has_usage properties on ObjectStorageQuota, and add ObjectStorageGroup.global_quotas() for listing global quotas.
• Extend unit/integration tests and fixtures to cover global quotas and the new quota fields.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
linode_api4/objects/object_storage.py	Adds quota_type/has_usage to ObjectStorageQuota and introduces ObjectStorageGlobalQuota model + usage call.
linode_api4/groups/object_storage.py	Adds ObjectStorageGroup.global_quotas() collection method.
test/unit/objects/object_storage_test.py	Adds unit coverage for new quota fields and global quota get/list/usage flows.
test/integration/models/object_storage/test_obj_quotas.py	Extends integration coverage for quota_type/has_usage and adds global quota tests and 404 handling cases.
test/fixtures/object-storage_quotas_obj-objects-us-ord-1.json	Updates quota fixture to include quota_type and has_usage.
test/fixtures/object-storage_quotas.json	Updates quotas list fixture to include quota_type and has_usage.
test/fixtures/object-storage_global-quotas.json	Adds fixture for global quotas list endpoint.
test/fixtures/object-storage_global-quotas_obj-access-keys-per-account.json	Adds fixture for a single global quota GET endpoint.
test/fixtures/object-storage_global-quotas_obj-access-keys-per-account_usage.json	Adds fixture for global quota usage endpoint.

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[mgwoj]

Should we skip silently?

[zliang-akamai]

Maybe keep it verbose, so we would know when it's skipped. I think most account will be with a quota, so this branch is very unlikely to be triggered.

[mawilk90]

@zliang-akamai this test (and the others too) will fail when Object Storage is disabled in the account settings, i.e. test_linode_client.object_storage.quotas() will return error 404 Not found and pytest.skip will never be reached. I agree that this kind of cases will be rare but should we handle them anyway somehow?