When a user uploads a template version that has two presets with a common name
Then the following unfriendly error message is presented:

=== ✘ Cleaning Up [16ms]
Encountered an error running "coder templates push", see "coder templates push --help" for more information
error: internal provisionerserver error: execute transaction: insert workspace presets and parameters: insert workspace preset: insert preset and parameters: execute transaction: insert preset: pq: duplicate key value violates unique constraint "idx_unique_preset_name"

We should catch this error and preset a more friendly error that communicates the validation error clearly.