ui: add cypress test coverage to existing DB Console pages

[dhartunian]

We should add basic functionality coverage to all DB Console pages using Cypress. This will enable us to verify that core functionality is working as we modify DB Console internals in the upcoming release.

As a rule of thumb, covering interactions such as selecting something from a dropdown and making sure the page updates is a good thing to add coverage for. Checking that a tooltip appears on hover is not.

Coverage should extend to top-level pages and their children. Advanced Debug is except for this ticket.

• Overview
• Metrics
• Databases
• SQL Activity
• Insights
• Network
• Top Ranges
• Jobs
• Schedules

Jira issue: CRDB-58146

Epic CRDB-58145

[blathers-crl]

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