disagg: Fix deployed on kingsoft ks3

[JaySon-Huang]

What problem does this PR solve?

Issue Number: close #10598, ref #10569

Problem Summary:

What is changed and how it works?

* Support parsing kingsoft ks3 endpoint as `CloudVendor::KingsoftCloud`
* Improve the compatibility of deployed under unknown cloud vendor that need virtual addressing

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • Verified on internal testing env with kingsoft cloud ks3
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[Copilot]

Pull request overview

This PR adds support for Kingsoft Cloud KS3 object storage and improves the logic for handling unknown cloud vendors with respect to virtual addressing requirements. The changes enable TiFlash to properly detect and configure Kingsoft Cloud endpoints while maintaining backward compatibility for other S3-compatible services.

Key changes:

• Added KingsoftCloud vendor enum and renamed/reorganized Unknown vendor types to distinguish between services requiring virtual addressing (Unknown) and those not requiring it (UnknownFixAddress)
• Updated endpoint parsing regex to recognize Kingsoft Cloud endpoint patterns (ks3--internal.ksyuncs.com and ks3-.ksyuncs.com)
• Enhanced port-based logic to better determine when unknown vendors need virtual addressing (default ports) versus fixed addressing (custom ports)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
dbms/src/Storages/S3/S3Common.h	Added KingsoftCloud enum value and split Unknown into UnknownFixAddress and Unknown to differentiate virtual addressing requirements
dbms/src/Storages/S3/S3Common.cpp	Updated regex pattern to parse Kingsoft Cloud endpoints, refined vendor detection logic with port-based checks for unknown vendors
dbms/src/Storages/S3/Credentials.cpp	Added credential provider handling for KingsoftCloud (falls through to AWS providers) and properly handles both Unknown variants
dbms/src/Storages/S3/tests/gtest_s3common.cpp	Added comprehensive test cases for Kingsoft Cloud endpoints (internal/external) and expanded tests for unknown vendor scenarios with various port configurations

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JinheLin, Lloyd-Pottiger

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [JinheLin,Lloyd-Pottiger]

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-09 08:55:47.82876368 +0000 UTC m=+944892.642541252: ☑️ agreed by Lloyd-Pottiger.
• 2025-12-09 12:05:19.64777463 +0000 UTC m=+956264.461552202: ☑️ agreed by JinheLin.

[JaySon-Huang]

/cherry-pick release-nextgen-20251011

[ti-chi-bot]

@JaySon-Huang: new pull request created to branch release-nextgen-20251011: #10600.

Details

In response to this:

/cherry-pick release-nextgen-20251011

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