CBG-3843: include collection names in status of resync

[gregns1]

CBG-3843

• Refactored function that gets collection id's for resync to also return the collection names
• Add the list of collection names to the manager object to then be used in the status function
• Change has been made to both DCP resync and query resync
• Had to make the collection list on status struct omitempty as when calling endpoint to start resync the status is returned but at this point the Run() function hasn't started to calculate the collections its running on. To avoid the initial POST call returning null for collections I have made it omit empty

Pre-review checklist

• Removed debug logging (fmt.Print, log.Print, ...)
• Logging sensitive data? Make sure it's tagged (e.g. base.UD(docID), base.MD(dbName))
• Updated relevant information in the API specifications (such as endpoint descriptions, schemas, ...) in docs/api

Integration Tests

• GSI=true,xattrs=true https://jenkins.sgwdev.com/job/SyncGateway-Integration/2454/

[bbrks]

Looks good, just a suggestion on using an alternative assertion facility

[bbrks]

You should be able to use (assert|require).ElementsMatch for an equivalent to this

https://pkg.go.dev/github.com/stretchr/testify/assert#ElementsMatch

[gregns1]

Had no idea that existed! Updated to use that assertion.