feat(oraclecloud): support regionless SDK setup

[HugoPBrito]

Context

Oracle Cloud credentials in Prowler can be valid without using a user-selected scan region. The SDK needs a safe internal region only to bootstrap the OCI client and discover subscribed regions.

Description

This PR updates the Oracle Cloud provider initialization so API-key authentication can fall back to the internal default region when no explicit scan region filter is provided. It also adds SDK tests for regionless credentials and documents the SDK change in the changelog.

Changed files:

File	Change
prowler/CHANGELOG.md	Adds the SDK changelog entry.
prowler/providers/oraclecloud/oraclecloud_provider.py	Adds the regionless fallback behavior.
tests/providers/oraclecloud/oraclecloud_provider_test.py	Adds SDK coverage for regionless OCI setup.

Steps to review

1. Review the SDK diff against the platform slice.
2. Confirm the SDK changes match the SDK portion of feat: support regionless OCI provider setup #11565.
3. Confirm the API slice builds on this PR.

Validation previously run for this slice:

uv run pytest tests/providers/oraclecloud/oraclecloud_provider_test.py

Checklist

Community Checklist

• This feature/issue is listed in here or roadmap.prowler.com
• Is it assigned to me, if not, request it via the issue/feature in here or Prowler Community Slack

• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.
• Review if is needed to change the Readme.md
• Ensure new entries are added to CHANGELOG.md, if applicable.

SDK/CLI

• Are there new checks included in this PR? No
  • If so, do we need to update permissions for the provider? Please review this carefully.

UI

• All issue/task requirements work as expected on the UI
• If this PR adds or updates npm dependencies, include package-health evidence (maintenance, popularity, known vulnerabilities, license, release age) and explain why existing/native alternatives are insufficient.
• Screenshots/Video of the functionality flow (if applicable) - Mobile (X < 640px)
• Screenshots/Video of the functionality flow (if applicable) - Table (640px > X < 1024px)
• Screenshots/Video of the functionality flow (if applicable) - Desktop (X > 1024px)
• Ensure new entries are added to CHANGELOG.md, if applicable.

API

• All issue/task requirements work as expected on the API
• Endpoint response output (if applicable)
• EXPLAIN ANALYZE output for new/modified queries or indexes (if applicable)
• Performance test results (if applicable)
• Any other relevant evidence of the implementation (if applicable)
• Verify if API specs need to be regenerated.
• Check if version updates are required (e.g., specs, uv, etc.).
• Ensure new entries are added to CHANGELOG.md, if applicable.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Chain Context

Field	Value
Chain	OCI regionless provider setup split from #11565
Tracker PR	#11565
Position	2 of 4
Base	ci/oci-regionless-platform-11565
Depends on	#11739
Follow-up	#11741
Review budget	357 / 400
Starts at	Platform CI guard slice
Ends with	SDK regionless OCI provider setup

Chain Overview

master
 └── #11739 Platform CI guard
      └── 📍 #11740 SDK regionless OCI setup
           └── #11741 API regionless OCI credentials
                └── #11742 UI regionless OCI credentials

Scope

• Includes: SDK provider fallback, SDK tests, and SDK changelog from feat: support regionless OCI provider setup #11565.
• Excludes: API and UI credential handling.

Autonomy

• CI is expected to pass for this PR branch
• This PR has one deliverable scope
• This PR can be rolled back without unrelated changes
• Tests, docs, or manual verification cover this unit

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch feat/oci-regionless-sdk-chain-11565

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[danibarranqueroo]

Move this into a new section for 5.33.0