error message for bucket creation is ambiguous

[kubosuke]

Please only report specific issues with flyctl behavior. Anything like a support request for your application should go to https://community.fly.io. More people watch that space and can help you faster!

Describe the bug
Briefly, describe what broke and provide the following details:

when bucket name is not matching naming rule, https://www.tigrisdata.com/docs/buckets/bucket-rules/
it returns ambiguous error

❯ flyctl storage create -n "afdshjfkjdhakjfhdsjkfhkjdfhaskjhfjdksafhjkahfkjdhsafkjhdakjfhskjfhakjfdhkjdsahkj"
Error: input:3:2: createAddOn The specified bucket is not valid.

• Operating system
• fly version

flyctl on  fix/storage-name-length-error-handling [?] via 🐹 v1.25.6 took 3s
❯ f --version
fly version 0.4.4

** Paste your fly.toml

# paste your config file here

** Command output: **

❯ flyctl storage create -n "afdshjfkjdhakjfhdsjkfhkjdfhaskjhfjdksafhjkahfkjdhsafkjhdakjfhskjfhakjfdhkjdsahkj"
Error: input:3:2: createAddOn The specified bucket is not valid.

[kubosuke]

PR #4729