*: add metrics for stats healthy

[xuyifangreeneyes]

What problem does this PR solve?

Issue Number: close #34691

Problem Summary:
Add metrics about table stats healthy.

What is changed and how it works?

1. Add metrics about table stats healthy.
2. Adjust panels in Statistics.

Check List

Tests

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

Check whether grafana panels looks right.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Yisaer
• chrysan

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After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/cdf418dee6022a43b6807807422e9d20f5d041e5

[xuyifangreeneyes]

/cc @chrysan @Yisaer

[chrysan]

/merge

[ti-chi-bot]

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

Commit hash: 4ce91e0

[sre-bot]

TiDB MergeCI notify

🔴 Bad News! New failing [1] after this pr merged.
These new failed integration tests seem to be caused by the current PR, please try to fix these new failed integration tests, thanks!

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/common-test	🟥 failed 2, success 10, total 12	12 min	New failing
idc-jenkins-ci-tidb/integration-common-test	✅ all 11 tests passed	11 min	Fixed
idc-jenkins-ci/integration-cdc-test	🟢 all 34 tests passed	22 min	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	6 min 54 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	6 min 3 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 52 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	5 min 45 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	4 min 3 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	2 min 56 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed