Support `webviewId` in `when` under `editor/title`

[worksofliam]

I would like to add buttons/commands to the webview panel, much like we can do with editor titles.

Here's an example:

      "editor/title": [
        {
          "when": "editorLangId == sql && code-for-ibmi:connected == true && vscode-db2i:statementCanCancel != true",
          "group": "navigation@1",
          "submenu": "sql/editor/context"
        },
        {
          "command": "vscode-db2i.statement.cancel",
          "when": "(editorLangId == sql || webviewId == sqlResultSet) && vscode-db2i:statementCanCancel == true",
          "group": "navigation@1"
        }
      ],

Working with editor:

Not working in webview:

Or, perhaps, there is another context I should use for webview buttons? I don't believe it to be webview/context.

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