Add patch API

[avlitman]

Adding new API:
/api/v1/alerting/rules | PATCH
/api/v1/alerting/rules/ruleId | PATCH

update user defined alert:
RULE_ID="TestSinglePatch/15a2940d8cdb3cfd51c81261ad11636094c959259469d41ddce1dd3581531bb3" && curl -s -X PATCH "http://localhost:9001/api/v1/alerting/rules/$RULE_ID" -H "Content-Type: application/json" -d '{"alertingRule":{"alert":"TestSinglePatch","expr":"cpu > 85","for":"5m","labels":{"severity":"critical","team":"frontend","environment":"production"},"annotations":{"summary":"Critical CPU usage","description":"CPU usage is above 85% for 5 minutes"}}}' | jq '.'

{
  "id": "TestSinglePatc;35b9655987a18272b4c5a5e298f2056162992a1e8c41d1487378fb926c340301",
  "status_code": 204
}

bulk update user defined alerts:
RULE1_ID="BulkTestAlert1/cde519b0d13ed1705006250e84025cf7817e9d0b9b93be59788d0039ed4c2ac3" && RULE2_ID="BulkTestAlert2/78d297397da44f293ab542b16268d0e83138f60cf8f02628df0a7c28fb416ea7" && curl -s -X PATCH "http://localhost:9001/api/v1/alerting/rules" -H "Content-Type: application/json" -d "{"ruleIds":["$RULE1_ID","$RULE2_ID"],"labels":{"severity":"critical","team":"sre","environment":"production"}}" | jq '.'

{
  "rules": [
    {
      "id": "BulkTestAlert1;6bda8aac4121f0f3e3b2fa8205ce85d3ac142514d01a83ba8614f63e18fd0730",
      "status_code": 204
    },
    {
      "id": "BulkTestAlert2;6428c8746d9f1862fb2e384dc489008efdec8a196f123242d97b5bec0c1c7dc9",
      "status_code": 204
    }
  ]
}

update platform alert:
RULE_ID="TestPlatformPatchSingle;73e926c75ad7f21249d72be4052f714aae009e9c430c15a5f49483760eaf8d8f" && curl -s -X PATCH "http://localhost:9001/api/v1/alerting/rules/$RULE_ID" -H "Content-Type: application/json" -d '{"alertingRule":{"alert":"TestPlatformPatchSingle","expr":"up == 0","for":"2m","labels":{"severity":"critical","team":"platform","environment":"production"},"annotations":{"summary":"Testing single patch for platform alerts","description":"This is a test alert for platform single patch"}}}' | jq '.'
{
"id": "TestPlatformPatchSingle;73e926c75ad7f21249d72be4052f714aae009e9c430c15a5f49483760eaf8d8f",
"status_code": 204
}

kubectl get alertrelabelconfig alertmanagement-testplatformpatchsingle-73e926c75ad7f21249d72be4052f714aae009e9c430c15a5f49483760eaf8d8f -n openshift-monitoring -o yaml | grep -A 30 "spec:"

spec:
  configs:
  - action: Replace
    regex: TestPlatformPatchSingle;.*
    replacement: critical
    sourceLabels:
    - alertname
    - severity
    targetLabel: severity
  - action: Replace
    regex: TestPlatformPatchSingle;.*
    replacement: production
    sourceLabels:
    - alertname
    - environment
    targetLabel: environment

bulk update platform alert:
RULE1_ID="TestPlatformBulkNew1;58eb54715dc0ea0d1da4cae0aa7a556c7281dd662500635ee3e49c9d0a25920d" && RULE2_ID="TestPlatformBulkNew2;e43e9eabc0467e3912b96c3854fbc79ce7face00037f4e94b0e3feb4337baf83" && curl -s -X PATCH "http://localhost:9001/api/v1/alerting/rules" -H "Content-Type: application/json" -d "{"ruleIds":["$RULE1_ID","$RULE2_ID"],"labels":{"severity":"critical","team":"platform",
"environment":"production"}}" | jq '.'

{
  "rules": [
    {
      "id": "TestPlatformBulkNew1;58eb54715dc0ea0d1da4cae0aa7a556c7281dd662500635ee3e49c9d0a25920d",
      "status_code": 204
    },
    {
      "id": "TestPlatformBulkNew2;e43e9eabc0467e3912b96c3854fbc79ce7face00037f4e94b0e3feb4337baf83",
      "status_code": 204
    }
  ]
}

kubectl get alertrelabelconfig -n openshift-monitoring -o json | jq -r '.items[] | select(.metadata.name | contains("testplatformbulknew")) | {name: .metadata.name, namespace: .metadata.namespace, configs: .spec.configs}' | head -50

{
  "name": "alertmanagement-testplatformbulknew1-58eb54715dc0ea0d1da4cae0aa7a556c7281dd662500635ee3e49c9d0a25920d",
  "namespace": "openshift-monitoring",
  "configs": [
    {
      "action": "Replace",
      "regex": "TestPlatformBulkNew1;.*",
      "replacement": "critical",
      "sourceLabels": [
        "alertname",
        "severity"
      ],
      "targetLabel": "severity"
    },
    {
      "action": "Replace",
      "regex": "TestPlatformBulkNew1;.*",
      "replacement": "platform",
      "sourceLabels": [
        "alertname",
        "team"
      ],
      "targetLabel": "team"
    },
    {
      "action": "Replace",
      "regex": "TestPlatformBulkNew1;.*",
      "replacement": "production",
      "sourceLabels": [
        "alertname",
        "environment"
      ],
      "targetLabel": "environment"
    }
  ]
}
{
  "name": "alertmanagement-testplatformbulknew2-e43e9eabc0467e3912b96c3854fbc79ce7face00037f4e94b0e3feb4337baf83",
  "namespace": "openshift-monitoring",
  "configs": [
    {
      "action": "Replace",
      "regex": "TestPlatformBulkNew2;.*",
      "replacement": "platform",
      "sourceLabels": [
        "alertname",
        "team"
      ],
      "targetLabel": "team"
    },