[Synapse] Deploy test resources step failing on nightly tests

[chamons]

Builds such as this are failing with:

Name 'sparkt499f98df8c4d4f46' is invalid. The name must be at
| most 15 characters long and must contain only alphanumeric

Discussions suggest there is a test-resources.json file that needs updating with a shorter name.

[jsquire]

Following-up on the Teams conversation, I'll add the pedantic issue stuff here. 😄

For work-item issues, we're asked to add an estimate, milestone, and (if possible) assign to an epic. If this is work that isn't scheduled, adding to the "Backlog" milestone is a good place to park, and allows you to defer estimating.

[tg-msft]

This was discussed internally at one point and the suggestion was to use https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/template-functions-string?tabs=json#take to trim the random name down to the right number of characters for a spark job.