tici: auto-generate TiCI changefeed sinkURI from s3 config

[3pointer]

Summary

• auto-generate TiCI changefeed sinkURI from spec.tici.s3 when spec.tici.changefeed.sinkURI is empty
• detect GCS endpoint (storage.googleapis.com) and generate gcs://...; keep existing MinIO/S3 behavior
• preserve existing guard: changefeed is only created when TiCI is configured
• add tests for MinIO/GCS auto-generation, sinkURI override, and disabled/no-TiCI cases
• update GCS examples/docs to rely on auto-generated sinkURI

Testing

• go test ./pkg/manager/member/startscript/v1 ./pkg/manager/member/startscript/v2

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[lybcodes]

/test pull-e2e-kind-dmcluster

[lybcodes]

/test pull-e2e-kind-basic

[lybcodes]

/test pull-e2e-kind-br

[ti-chi-bot]

@3pointer: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-e2e-kind-dmcluster	7a6567e	link	false	/test pull-e2e-kind-dmcluster
pull-e2e-kind-br	7a6567e	link	false	/test pull-e2e-kind-br
pull-e2e-kind-basic	7a6567e	link	false	/test pull-e2e-kind-basic

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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Details

Needs approval from an approver in each of these files:

• OWNERS [csuzhangxc]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-03-13 10:16:53.633363874 +0000 UTC m=+1670.634137342: ☑️ agreed by csuzhangxc.