tici: preview port feature/fts onto master

[3pointer]

What problem does this PR solve?

Issue Number: N/A

Problem Summary:

This draft PR provides a reviewable integration preview of the TiCI-backed FTS capability on the current TiFlash master branch. It applies the capability delta from 661e9b5887 to feature/fts HEAD instead of merging the feature branch history.

What is changed and how it works?

tici: preview port feature/fts onto master

• Applies the feature capability patch on top of TiFlash master 5c72bfa56d.
• Adds 18 new paths and integrates the cleanly applicable existing-file changes.
• Resolves four textual conflicts in .gitmodules, MPPTask.cpp, gtest_new_kvstore.cpp, and tests/docker/util.sh.
• Preserves master's bypass-lock lifecycle in MPPTask.cpp and adds TiCI QueryShardInfos initialization alongside it.
• Keeps the newer master tipb pin.
• Uses a client-c integration commit based on client-c master plus the TiCI remote-read delta: 3pointer/client-c@2214b0b.
• Temporarily uses kvproto 811b5283cd, because the TiCI estimate-count RPC and its generated files cannot be cleanly separated from the intervening kvproto history. This dependency needs to be narrowed before a production merge.

The resulting top-level diff is 65 paths with 18 additions (+2833/-40). This PR is intended for diff review and effort assessment, not merge readiness.

Check List

Tests

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

Manual checks performed:

• git diff --cached --check
• bash -n tests/docker/util.sh tests/fullstack-test/run.sh tests/fullstack-test2/run.sh tests/tidb-ci/run.sh
• Verified no unresolved conflict markers and exactly 18 added paths.
• Started cargo check -p tici-search-lib; it reached the TiCI/searchlib dependency build without source errors, but was stopped while the first-time grpcio-sys C++ build was still running.

Full TiFlash configure/build was not run because the available CMake is 3.10.3 while the repository requires CMake 3.23 or newer.

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

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