fix(ui): Fix mechansim type link placement

[mattjohnsonpint]

Small nitpick. Consider an event such as:

{
  "type": "error",
  "exception": {
    "values": [
      {
        "type": "Exception",
        "mechanism": {
          "type": "some_mechanism_type",
          "help_link": "https://foo.bar",
          "description": "This is a human-readable description of some mechanism type."
        }
      }
    ]
  }
}

Within the mechanism, type is required, but help_link and description are optional.

When either are provided, currently the placement of the link or hover card is on the name of the pill (the word mechanism).

• Example 1:
  

• Example 2:
  

It should instead be on the value of the pill (which corresponds to the type).

• Example 1:
  

• Example 2:
  

[malwilley]

Makes sense!