[WIP] [UI Tests] Enabled all login tests.

[pachlava]

Why

loginWithEmailPassword was disabled during migration to Builkite; loginWithPasswordlessAccount and loginWithMagicLink were disabled in April, for some reason.

Enabling them back looks to cause no issues, so I see no reason not to run them.

To test:

• CI is green.

[wpmobilebot]

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[wpmobilebot]

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[pachlava]

Closing as stale / obsolete