test: Add unit tests for MessagingCanvasPhase auto-message and session reducer actions [CHI-3828]

[Copilot]

Description

Adds missing unit tests for the changes introduced in the parent PR (trigger message IP/contact identifier inclusion).

MessagingCanvasPhase — auto first message construction:

• contactIdentifier takes priority when present
• ipAddress used when contactIdentifier absent
• contactIdentifier preferred over ipAddress when both present
• Falls back to DEFAULT_CUSTOMER_DEFAULT_NAME ('Anonymous') when no identifier or localization available — tested via jest.spyOn on localizeKey (which otherwise returns the key name itself as fallback, making the hardcoded default unreachable without mocking)

session.reducer — new actions:

• ACTION_SET_IP_ADDRESS sets ipAddress in state
• ACTION_SET_CONTACT_IDENTIFIER sets contactIdentifier in state

Checklist

• Corresponding issue has been opened
• New tests added
• Feature flags added
• Strings are localized
• Tested for chat contacts
• Tested for call contacts

Other Related Issues

Parent PR: #4271

Verification steps

Run npm run test in aselo-webchat-react-app/ — all 411 tests pass.

AFTER YOU MERGE

1. Cut a release tag using the Github workflow. Wait for it to complete and notify in the #aselo-deploys Slack channel.
2. Comment on the ticket with the release tag version AND any additional instructions required to configure an environment to test the changes.
3. Only then move the ticket into the QA column in JIRA

You are responsible for ensuring the above steps are completed. If you move a ticket into QA without advising what version to test, the QA team will assume the latest tag has the changes. If it does not, the following confusion is on you! :-P