Fix Cline dict handling

[lukehinds]

Describe the issue

I think #1147 may have unknowingly broken Cline messages when retrieved by the dashboard APIs.

Cline often will use dicts within its messages and so the following bug now occurs:

AttributeError: 'dict' object has no attribute 'split'
2025-02-26T13:59:06.789419Z [error    ] Error while getting messages   lineno=426 module=v1 pathname=/app/src/codegate/api/v1.py
Traceback (most recent call last):
  File "/app/src/codegate/api/v1.py", line 421, in get_workspace_messages
    conversations, _ = await v1_processing.parse_messages_in_conversations(
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/src/codegate/api/v1_processing.py", line 444, in parse_messages_in_conversations
    conversations, map_q_id_to_conversation = await match_conversations(partial_question_answers)
                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/src/codegate/api/v1_processing.py", line 401, in match_conversations
    deduped_alerts = await remove_duplicate_alerts(selected_partial_qa.alerts)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/src/codegate/api/v1_processing.py", line 520, in remove_duplicate_alerts
    trigger_string_content = alert.trigger_string.split("Context")[0]
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'dict' object has no attribute 'split'

Steps to Reproduce

Install v0.1.25 and run a Cline prompt session and then attempt to view the message history.

Operating System

MacOS (Arm)

IDE and Version

N/A

Extension and Version

[3.4.9]

Provider

Other

Model

claude-sonnet.3.5

Codegate version

v0.1.25

Logs

No response

Additional Context

No response