metaservice: support CSE keyspace-level GC

[pingyu]

What problem does this PR solve?

Issue Number: close #70332

Problem Summary:

Related PD issue: tikv/pd#11108

Related TiCDC incident: pingcap/ticdc#5785

Essential v1 keyspaces advertise keyspace-level GC with safe_point_version=v2. TiDB rejects dedicated meta service groups for those keyspaces because it only recognizes the native gc_management_type=keyspace_level metadata. client-go then cannot use the CSE keyspace-scoped transaction safepoint path, contributing to the safepoint mismatch that blocks TiCDC SchemaStore initialization and changefeed creation.

What changed and how does it work?

• Use tikv.IsCSEKeyspaceLevelGC in addition to the native PD predicate when validating a dedicated meta service group.
• Add regression coverage for CSE metadata without gc_management_type.
• Temporarily pin the client-go fork for the stacked draft; remove the replacement after tikv: support CSE keyspace-level transaction safepoint tikv/client-go#2040 merges.
• Regenerate DEPS.bzl so Bazel uses the same client-go fork replacement as go.mod.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Commands run:

• go test -run ^TestGetGroup$ -tags=intest,deadlock -count=1 -v from pkg/metaservice
• gopls check pkg/metaservice/metamanager.go pkg/metaservice/metamanager_test.go
• make bazel_prepare
• make check-bazel-prepare
• bazel test --define gotags=intest,deadlock //pkg/metaservice:metaservice_test

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

Support dedicated meta service groups for Essential v1 keyspaces that use keyspace-level GC.

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[pingyu]

Superseded by tikv/pd#11100 commit 31378cb, which extends pd.IsKeyspaceUsingKeyspaceLevelGC to recognize safe_point_version=v2. TiDB #69942 already calls that predicate in metaservice.GetGroup, so the TiDB-specific OR and temporary dependency replacements are unnecessary. Verified the #69942 + client-go#2024 + reviewed PD stack with: GOTOOLCHAIN=go1.25.12 go test -mod=mod -run TestGetGroup -tags=intest,deadlock -count=1.