MPT-16437 Update resource account mixin usage

[albertsola]

Closes MPT-16437

• Consolidated mixin imports across account resource modules to import from mpt_api_client.resources.accounts.mixins instead of individual submodules (account.py, account_users.py, accounts_users.py, buyers.py, erp_links.py, sellers.py, users.py)
• Replaced dedicated imports for activatable_mixin, validate_mixin, invitable_mixin, and blockable_mixin with unified package-level imports
• Updated import sources for: ActivatableMixin/AsyncActivatableMixin, ValidateMixin/AsyncValidateMixin, InvitableMixin/AsyncInvitableMixin, BlockableMixin/AsyncBlockableMixin
• No behavioral changes or public API signature modifications; purely import refactoring

[coderabbitai]

📝 Walkthrough

Walkthrough

Consolidates mixin imports across account resource modules by importing ActivatableMixin, AsyncActivatableMixin, InvitableMixin, AsyncInvitableMixin, BlockableMixin, AsyncBlockableMixin, ValidateMixin, and AsyncValidateMixin from the unified mpt_api_client.resources.accounts.mixins package instead of their previous submodules.

Changes

Cohort / File(s)	Summary
Account modules mpt_api_client/resources/accounts/account.py, mpt_api_client/resources/accounts/account_users.py, mpt_api_client/resources/accounts/accounts_users.py, mpt_api_client/resources/accounts/buyers.py, mpt_api_client/resources/accounts/erp_links.py, mpt_api_client/resources/accounts/sellers.py, mpt_api_client/resources/accounts/users.py	Replaced imports that referenced specific mixin submodules (e.g., activatable_mixin, invitable_mixin, blockable_mixin, validate_mixin) with imports from the consolidated package mpt_api_client.resources.accounts.mixins. No changes to class signatures or runtime logic.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• MPT-14936 add e2e test suite for notification subscribers handling #136: Related PR that touches mixin imports and usage in the same account resource modules, indicating ongoing consolidation or reorganization of the mixins module structure.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Test Coverage Required	⚠️ Warning	PR modifies 7 code files in accounts resource modules with import consolidation changes but includes no test file updates or additions.	Add or update tests to verify the consolidated imports work correctly and don't break functionality in the accounts resource modules.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Jira Issue Key In Title	✅ Passed	The PR title contains exactly one Jira issue key (MPT-16437) in the correct MPT-XXXX format at the beginning.
Single Commit Required	✅ Passed	The pull request contains exactly one commit consolidating all import path changes across seven modified files related to mixin usage in the accounts resources module.

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Warning

Review ran into problems

🔥 Problems

Errors were encountered while retrieving linked issues.

Errors (1)

• MPT-16437: Cannot read properties of undefined (reading 'map')

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud