fix: adjust name for ActionIdentifier to a fixed value "a0"

[SZL741023]

Tracking issue

Why are the changes needed?

Assign value "a0" to details.action.id.name , but it is one of the unique index in idx_action_domain.
If this value is fixed, that mean all workflow only can have a run task, so add the run_name to be one of the unique index in idx_action_domain.

What changes were proposed in this pull request?

Fix the duplicated key not allowed issue for adjusting details.action.id.name to fixed value
Add run_name to unique index idx_actions_identifier.
Add migrate function to drop old index idx_actions_identifier before build new type idx_actions_identifier
Sync action_test.go constraint

How was this patch tested?

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• changed: For changes in existing functionality.
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Setup process

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Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
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Related PRs

Docs link

Test Result

• create run

{
  "run": {
    "action": {
      "id": {
        "run": {
          "org": "testorg",
          "project": "flytesnacks",
          "domain": "development",
          "name": "rd4qrczzhklqrhvmt6zc"
        },
        "name": "a0"
      },
      "metadata": {
        "task": {
          "id": {
            "org": "testorg",
            "project": "flytesnacks",
            "domain": "development",
            "name": "hello_world.say_hello",
            "version": "ae90079690e275d2dd68fadbf4a66641"
          },
          "taskType": "python",
          "shortName": "hello_world.say_hello"
        },
        "actionType": "ACTION_TYPE_TASK",
        "funtionName": "hello_world.say_hello"
      },
      "status": {
        "phase": "ACTION_PHASE_QUEUED",
        "startTime": "2026-03-25T17:34:12.957506Z",
        "attempts": 1
      }
    }
  }
}

• get run details

{
  "details": {
    "action": {
      "id": {
        "run": {
          "org": "testorg",
          "project": "flytesnacks",
          "domain": "development",
          "name": "rd4qrczzhklqrhvmt6zc"
        },
        "name": "a0"
      },
      "metadata": {
        "task": {
          "id": {
            "org": "testorg",
            "project": "flytesnacks",
            "domain": "development",
            "name": "hello_world.say_hello",
            "version": "ae90079690e275d2dd68fadbf4a66641"
          },
          "taskType": "python",
          "shortName": "hello_world.say_hello"
        },
        "actionType": "ACTION_TYPE_TASK",
        "funtionName": "hello_world.say_hello"
      },
      "status": {
        "phase": "ACTION_PHASE_INITIALIZING",
        "startTime": "2026-03-25T17:34:12.957506Z"
      },

• main
  • Flyte 2 WIP #6583
    • fix: adjust name for ActionIdentifier to a fixed value "a0" 👈