[feat] support path style bucket references in the cluster object store

[eljohnson92]

What this PR does / why we need it:
this PR supports path style obj buckets for cluster object stores
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[Copilot]

Pull Request Overview

Adds support for path-style addressing for object store buckets by reading a new environment variable and applying it to the S3 client configuration.

• Introduces LINODE_OBJECT_STORAGE_USE_PATH_STYLE env var to toggle path-style addressing
• Sets opts.UsePathStyle on the S3 client based on that variable

Comments suppressed due to low confidence (2)

cloud/scope/common.go:132

• [nitpick] The local variable ObjUsePathStyle starts with an uppercase letter, which is unconventional for Go locals. Consider renaming it to objUsePathStyle for idiomatic consistency.

		if ObjUsePathStyle := os.Getenv("LINODE_OBJECT_STORAGE_USE_PATH_STYLE"); strings.ToLower(ObjUsePathStyle) == "true" {

cloud/scope/common.go:131

• Please document the new LINODE_OBJECT_STORAGE_USE_PATH_STYLE environment variable in the README or relevant configuration docs so users know how to enable path-style addressing.

		usePathStyle := false

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.83%. Comparing base (cb589b3) to head (169a8ee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #798   +/-   ##
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  Coverage   62.82%   62.83%           
=======================================
  Files          71       71           
  Lines        7177     7178    +1     
=======================================
+ Hits         4509     4510    +1     
  Misses       2401     2401           
  Partials      267      267           

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