Fix "Failed to find the thread indexes for given tab ..." warnings in tests

[canova]

Similar to #6048, since it's easier to spot the warnings, I also see these:

 PASS   browser  src/test/url-handling.test.ts
  ● Console

    console.warn
      Failed to find the thread indexes for given tab 123

      808 |     // This is not really a possible path. It might indicate a bug on the frontend
      809 |     // or backend.
    > 810 |     console.warn(`Failed to find the thread indexes for given tab ${tabID}`);
          |             ^
      811 |     return globalTracks;
      812 |   }
      813 |

      at warn (src/profile-logic/tracks.ts:810:13)
      at filterGlobalTracksByTab (src/profile-logic/tracks.ts:774:18)
      at src/actions/receive-profile.ts:1389:45
      at node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14
      at Object.dispatch (src/test/url-handling.test.ts:2116:5)

    console.warn
      Failed to find the thread indexes for given tab 321

      808 |     // This is not really a possible path. It might indicate a bug on the frontend
      809 |     // or backend.
    > 810 |     console.warn(`Failed to find the thread indexes for given tab ${tabID}`);
          |             ^
      811 |     return globalTracks;
      812 |   }
      813 |

      at warn (src/profile-logic/tracks.ts:810:13)
      at filterGlobalTracksByTab (src/profile-logic/tracks.ts:774:18)
      at src/actions/receive-profile.ts:1389:45
      at node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14
      at Object.dispatch (src/test/url-handling.test.ts:2128:5)

    console.warn
      Failed to find the thread indexes for given tab 123

      808 |     // This is not really a possible path. It might indicate a bug on the frontend
      809 |     // or backend.
    > 810 |     console.warn(`Failed to find the thread indexes for given tab ${tabID}`);
          |             ^
      811 |     return globalTracks;
      812 |   }
      813 |

      at warn (src/profile-logic/tracks.ts:810:13)
      at filterGlobalTracksByTab (src/profile-logic/tracks.ts:774:18)
      at src/actions/receive-profile.ts:267:45
      at node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14
      at dispatch (node_modules/redux/src/applyMiddleware.ts:52:38)
      at dispatch (src/actions/receive-profile.ts:216:5)
      at node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14
      at dispatch (node_modules/redux/src/applyMiddleware.ts:52:38)
      at dispatch (src/actions/receive-profile.ts:176:13)
      at node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14
      at dispatch (node_modules/redux/src/applyMiddleware.ts:52:38)
      at dispatch (src/actions/receive-profile.ts:423:11)
      at Object.dispatch (node_modules/redux-thunk/dist/cjs/redux-thunk.cjs:30:14)
      at dispatch (src/test/url-handling.test.ts:112:11)
      at Object._getStoreWithURL (src/test/url-handling.test.ts:2153:26)

I don't know yet if they are real issues or just warnings because we didn't add/update the pages array. Would be good to get rid of them too.

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