Follow-up to #2152
Related to https://github.com/webrecorder/browsertrix/pull/2487
This PR provides very basic validation of the `config.selectLinks`
argument on workflow creation and update. Namely, it checks that:
- `config.selectLinks` is not an empty array
- Each entry consists of two non-empty text sequences separated by `->`
At this point we're not validating the actual CSS selector on the
backend, though we could add that down the road.
Tests have been added accordingly.
Co-authored-by: Ilya Kreymer <ikreymer@gmail.com>
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