Fix: adjust agent sessions search tokens for prod values

What does this MR do and why?

Updating to use search tokens used in Prod:

• code_review/v1
• fix_pipeline/v1
• issue_to_merge_request

References

Related Issue: #576078 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

To Test in Duo Side Rail

1. Turn on the following feature flags: duo_workflow, duo_workflow_in_ci, ai_flow_triggers and duo_side_rail.
2. Make sure you are NOT in the new UI
3. Open Duo Chat and open the Sessions tab (the two overlapping squares icon).
4. Test search queries (see below for test cases)
5. If you see no Sessions then run the following query bundle exec rake "gitlab:duo_workflow:populate[50,20,1,<<YOUR_TEST_GROUP_PATH_HERE>>]" to create new agent sessions. Refresh the page.

To Test in Agent Sessions page

1. Navigate to a project with that has AI features enabled.
2. In the left side panel, you will see Automate with a tanuki icon. Select Sessions from the dropdown.
3. Test search queries (see below for test cases)

To Test in new UI Side Panel

1. To test this locally, make sure you have the following FFs enabled: paneled_view, global_topbar, tailwind_container_queriesAfter you can toggle New UI on in user's setting under the user's profile dropdown
2. Open the side panel and open Sessions.
3. Test search queries (see below for test cases)

Filter/Sort Testing Steps

Filtering

1. Select Flow and use one of the selected values.
2. Press Enter or click the search icon.
3. Validate filter works as expected.
4. If your term was not found, an empty result view should display. You can reset by refreshing the page or clicking the search icon again.

MR acceptance checklist

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Related to #576078 (closed)