[HTTP/OAS] Add tags and descriptions for uptime setting APIs

[lcawl]

Summary

Relates to #180056

This PR adds operation summaries for the uptime setting APIs in the generated OpenAPI document.
It also adds tags per #184320

How to test

Per #181277:

1. Start Elasticsearch (e.g. yarn es snapshot --license trial)
2. Add server.oas.enabled: true to kibana.dev.yml
3. Start Kibana (e.g. yarn start --no-base-path)
4. curl -s -u elastic http://localhost:5601/api/oas\?pathStartsWith\=/api/uptime/settings | jq > test.json

   "paths": {
    "/api/uptime/settings": {
      "get": {
        "summary": "Get uptime settings",
        "tags": [
          "uptime"
        ],

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 730e526
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-184268-730e526341e4
• Observability Deployment

Failed CI Steps

Metrics [docs]

✅ unchanged

History

• 💛 Build #214025 was flaky 3858de8

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[justinkambic]

LGTM!

Tested locally, seeing the expected JSON:

{                                                                             
  "openapi": "3.0.0",                                                         
  "info": {                                                                   
    "title": "Kibana HTTP APIs",                                              
    "version": "0.0.0"                                                        
  },                                                                          
  "servers": [                                                                
    {                                                                         
      "url": "http://localhost:5601"                                          
    }                                                                         
  ],                                                                          
  "paths": {                                                                  
    "/api/uptime/settings": {                                                 
      "get": {                                                                
        "summary": "",                                                        
        "description": "Get uptime settings",                                 
        "tags": [                                                             
          "uptime"                                                            
        ],                                                                    
        "responses": {                                                        
          "200": {                                                            
            "content": {                                                      
              "application/json; Elastic-Api-Version=2023-10-31": {           
                "schema": {                                                   
                  "type": "object",                                           
                  "properties": {                                             
                    "heartbeatIndices": {                                     
                      "type": "string",                                       
                      "minLength": 1                                          
                    },                                                        
                    "certAgeThreshold": {                                     
                      "minimum": 1,                                           
                      "type": "number"                                        
                    },                                                        
                    "certExpirationThreshold": {                              
                      "minimum": 1,                                           
                      "type": "number"                                        
                    },                            
...