feat(ui): support regionless OCI credentials

[HugoPBrito]

Context

Since OCI credential setup no longer requires a region, the UI should stop asking users for one during provider onboarding.

Description

This PR removes the OCI region field from the credentials form, updates the credential payload builder and related types, and adjusts UI/unit/E2E coverage for regionless OCI setup.

Changed files:

File	Change
ui/CHANGELOG.md	Adds the UI changelog entry.
ui/components/providers/workflow/forms/via-credentials/oraclecloud-credentials-form.tsx	Removes the OCI region input from the credentials form.
ui/hooks/use-credentials-form.ts	Updates credential form behavior.
ui/lib/provider-credentials/build-credentials.test.ts	Adds UI payload-builder coverage.
ui/lib/provider-credentials/build-credentials.ts	Builds regionless OCI credential payloads.
ui/tests/providers/providers-page.ts	Updates provider E2E helper behavior.
ui/tests/providers/providers.spec.ts	Updates provider E2E coverage.
ui/types/components.ts	Removes obsolete region typing.
ui/types/formSchemas.ts	Removes OCI region schema requirements.

Steps to review

1. Review the UI diff against the API slice.
2. Confirm the UI changes match the UI portion of feat: support regionless OCI provider setup #11565.
3. Confirm the final chain tree is equivalent to feat: support regionless OCI provider setup #11565.

Validation previously run for this slice:

pnpm vitest run --project unit lib/provider-credentials/build-credentials.test.ts

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	4 of 4
Base	feat/oci-regionless-api-chain-11565
Depends on	#11741
Follow-up	None
Review budget	82 / 400
Starts at	API regionless OCI credential support
Ends with	UI regionless OCI credential setup; final chain tree matches #11565

Chain Overview

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

Scope

• Includes: UI form, types, payload builder, UI tests, E2E helper/spec, and UI changelog from feat: support regionless OCI provider setup #11565.
• Excludes: platform, SDK, and API changes already covered by earlier PRs.

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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LGTM

[HugoPBrito]

Note: Fragment changelog must be used here.