support fetch server info without starting Proxy

[guo-shaoge]

What problem does this PR solve?

Issue Number: close #7436

Problem Summary:
Before: when tiflash proxy not start, we cannot fetch ServerInfo, so we use a guess value, which is not accurate for some env.
After: Can fetch ServerInfo even when proxy not start(In DisaggMode, TiFlash CN will not start proxy)

What is changed and how it works?

Mainly changes in pingcap/tidb-engine-ext#330 : No need to pass RaftStoreProxyHelper(it need to start proxy to init) to fetch ServerInfo. Only needs EngineStoreServerHelp, which tells rust code how to setup ServerInfo PB msg for tiflash server.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CalvinNeo
• xzhangxian1008

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[guo-shaoge]

/run-all-tests

[guo-shaoge]

/run-cherry-picker

[CalvinNeo]

lgtm

[xzhangxian1008]

LGTM

[guo-shaoge]

/merge

[ti-chi-bot]

@guo-shaoge: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f00bc79

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #7580.