Add ability to resend invitations

[antn]

Toward AUTH-5515.

Description

This adds support for the new resend invitation endpoint.

It can be used like this:

invitation = workos_client.user_management.resend_invitation(
    invitation_id="Z1uX3RbwcIl5fIGJJJCXXisdI"
)

Documentation

Does this require changes to the WorkOS Docs? E.g. the API Reference or code snippets need updates.

[x] Yes

If yes, link a related docs PR and add a docs maintainer as a reviewer. Their approval is required.

https://github.com/workos/workos/pull/47145

[greptile-apps]

Greptile Summary

• Added resend_invitation method to support resending invitations via new API endpoint
• Implemented in both sync (UserManagement) and async (AsyncUserManagement) classes with matching signatures
• Includes comprehensive test coverage for success and error scenarios (not found, expired, revoked, accepted)

Confidence Score: 5/5

• This PR is safe to merge with no concerns.
• The implementation follows existing patterns perfectly, includes both sync and async versions, has comprehensive test coverage including error cases, and introduces no security concerns or breaking changes.
• No files require special attention.

Sequence Diagram

sequenceDiagram
    participant User
    participant WorkOSClient
    participant UserManagement
    participant HTTPClient
    participant WorkOSAPI

    User->>WorkOSClient: resend_invitation(invitation_id)
    WorkOSClient->>UserManagement: resend_invitation(invitation_id)
    UserManagement->>HTTPClient: request(POST /invitations/{id}/resend)
    HTTPClient->>WorkOSAPI: POST /user_management/invitations/{id}/resend
    WorkOSAPI-->>HTTPClient: 200 OK (invitation data)
    HTTPClient-->>UserManagement: response
    UserManagement->>UserManagement: Invitation.model_validate(response)
    UserManagement-->>WorkOSClient: Invitation object
    WorkOSClient-->>User: Invitation object

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[greptile-apps]

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[linear]

AUTH-5515 Update Python SDK to include new resend invitation endpoint