LIMS-1064: Display dropdown or span depending on number of schema options

[ndg63276]

JIRA ticket: LIMS-1064

Summary:

In #621 we hard-coded the UI to say only CHIMP auto-scores were available. There are 275 plates in the database with MARCO scores, and of course other schemas may be used in future, So we should show a dropdown if mulitple schema results return, but just a span if only one schema results return.

Changes:

• Re-enable the schema dropdown, as well as an empty span
• Show or hide them according to the number of schemas returned

To test:

• Go to a container inspection with both MARCO and CHIMP scores, eg /containers/cid/177952, inspection on 9th Dec 2020, check a dropdown appears to choose between MARCO and CHIMP scores
• Switch to an older inspection (eg 21st July 2020) which just has MARCO scores, check the dropdown disappears and it just says "MARCO Auto Scores"
• Go to a newer plate (eg /containers/cid/317254) with just CHIMP scores, check it says "CHIMP Auto Scores"