Refactor and add BucketAccessor in preparation of framework migration for bucket resource

[zliang-akamai]

📝 Description

Add BucketAccessor for centralized object storage keys logic for the future Framework migration work for the bucket resource.

This branch is based on the feature branch of #2235, I will re-target the dev branch after #2235 being merged.

✔️ How to Test

make PKG_NAME="objbucket" test-int

make PKG_NAME="obj" test-int

[Copilot]

Pull request overview

This PR refactors object storage key resolution logic by introducing a BucketAccessor interface and centralizing the key retrieval logic in preparation for framework migration of the bucket resource. The changes improve code maintainability by extracting common patterns into reusable abstractions.

Changes:

• Introduced BucketAccessor interface to standardize access to bucket-related properties across resources
• Extracted object storage key resolution logic from ResourceModel into a standalone GetObjectStorageKeys function
• Added helper methods to BaseModel and ResourceModel to implement the BucketAccessor interface

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
linode/objbucket/framework_models.go	Added RegionOrCluster() and BucketLabel() methods to BaseModel to support BucketAccessor interface
linode/objbucket/framework_datasource_schema.go	Reordered schema attributes to group id and label at the top, created at the bottom
linode/obj/helpers.go	Updated call to use new standalone GetObjectStorageKeys function
linode/obj/framework_resource.go	Renamed method call from GetRegionOrCluster to RegionOrCluster
linode/obj/framework_models.go	Removed GetObjectStorageKeys method and added helper methods implementing BucketAccessor interface
linode/obj/bucket_accessor.go	Created new file with BucketAccessor interface and GetObjectStorageKeys function for centralized key resolution

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