feat: add index build state as readiness check indicator

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.20.x

What this PR does / why we need it:

将索引构建状态添加到就绪检测的指标中

Which issue(s) this PR fixes:

Fixes #6632

Does this PR introduce a user-facing change?

修复系统未启动完全时访问页面出错的问题

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.20%. Comparing base (c945a94) to head (6ef5634).
Report is 24 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6700      +/-   ##
============================================
+ Coverage     58.17%   58.20%   +0.02%     
  Complexity     3947     3947              
============================================
  Files           680      681       +1     
  Lines         23262    23226      -36     
  Branches       1582     1582              
============================================
- Hits          13532    13518      -14     
+ Misses         9106     9084      -22     
  Partials        624      624              

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[JohnNiang]

It works very well.

# http http://localhost:8090/actuator/health -pb

{
    "groups": [
        "liveness",
        "readiness"
    ],
    "status": "OUT_OF_SERVICE"
}

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• OWNERS [JohnNiang]

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