Refactor messaging refresh access token

[bosiraphael]

• Put error handling outside of refreshAndSaveAccessToken
• return after failing to refresh access token in processMessageBatchImport
• remove unnecessary token refresh in processMessageListFetch

[greptile-apps]

PR Summary

• Refactored refreshAndSaveAccessToken to remove error handling logic
• Removed dependency on ConnectedAccountRepository in fetchAllMessages
• Simplified processMessageListFetch by removing token refresh logic
• Improved error handling in processMessageBatchImport for token refresh failures

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