[WIP] Improve repository registration process

[Copilot]

Thanks for the feedback on #154. I've created this new PR, which merges into #154, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #154
Triggering comment (#154 (comment)):

@copilot

Read attached ADR: docs/adr/0006-ux-secrets-mgt-on-registration.md

Given that read_secret_version returns data of this form:
"""
{
"request_id":"a14f4fce-cd7e-2794-cbe5-cec07294119f",
"lease_id":"",
"renewable":false,
"lease_duration":0,
"data":{
"data":{
"accessKey":"f1",
"bucket":"foo",
"is_aws":true,
"secretKey":"f2"
},
"metadata":{
"created_time":"2025-1230T13:42:46.443541392Z",
"custom_metadata":"None",
"deletion_time":"",
"destroyed":false,
"version":1
}
},
"wrap_info":"None",
"warnings":"None",
"auth":"None",
"mount_type":"kv"
}
"""

Change behavior of update.

• For each bucket, [dataBucket, artifactBucket]:
  • Change the behavior of get_registration. Return dataBucketCreatedTime, artifactBucketCreatedTime, set from data.metadata.created_time
  • If it exist, display a notice "This bucket information was saved on {xxxxBucketCreatedTime}. Click here to re-enter."
    • If the user clicks, reveal the bucket form.
• If the bucket information doesn't exist, display the form

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