fix(client): Ensure stale data is discarded when event code changes

[evan10s]

If the user changes the event code, the following will now occur:

1. The client will refresh the match list
2. The currently selected match (which in reality is a match key that is specific to an event) is cleared. This also clears the description text and found match video files, since these both depend on the selected match key.

This should mean that changing the event code will now "just work" without any need to refresh the page.

Other changes:

• If the event name is changed, the match videos list will refresh to ensure the selected video titles are updated

TODO:

• [x] Confirm that worker uploads are not affected by changing the event code (as in, any uploads scheduled prior to changing the event code should not be affected

Closes #113

[github-actions[bot]]

:tada: This PR is included in version 3.2.2 :tada:

The release is available on:

• GitHub release
• v3.2.2

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