Use getUrlPartsWithStrippedDefaultPort instead of getUrlParts (elasti…

…c#199264)

## Summary

Use getUrlPartsWithStrippedDefaultPort to avoid this
[issue](elastic#195902 (comment))
on MKI:

```
Serverless Observability - Deployment-agnostic api integration - Custom Threshold rule AVG - PCT - FIRED Rule creation should set correct action variables

Error: expected 'https://bk-serverless-ftr-3067-e697d43e3ad9-e0ac80.kb.eu-west-1.aws.qa.elastic.cloud/app/observability/alerts/1e0c2d3e-e5c2-4bfe-9df0-d46681253b9f'
to sort of equal 'https://bk-serverless-ftr-3067-e697d43e3ad9-e0ac80.kb.eu-west-1.aws.qa.elastic.cloud:443/app/observability/alerts/1e0c2d3e-e5c2-4bfe-9df0-d46681253b9f'
```

(cherry picked from commit 996104f)

x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/custom_threshold/custom_eq_avg_bytes_fired.ts

@@ -249,7 +249,7 @@ export default function ({ getService }: DeploymentAgnosticFtrProviderContext) {
           docCountTarget: 1,
         });
 
-        const { protocol, hostname, port } = kbnTestConfig.getUrlParts();
+        const { protocol, hostname, port } = kbnTestConfig.getUrlPartsWithStrippedDefaultPort();
         expect(resp.hits.hits[0]._source?.ruleType).eql('observability.rules.custom_threshold');
         expect(resp.hits.hits[0]._source?.alertDetailsUrl).eql(
           `${protocol}://${hostname}${port ? `:${port}` : ''}/app/observability/alerts/${alertId}`

x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/custom_threshold/documents_count_fired.ts

@@ -247,7 +247,7 @@ export default function ({ getService }: DeploymentAgnosticFtrProviderContext) {
           docCountTarget: 1,
         });
 
-        const { protocol, hostname, port } = kbnTestConfig.getUrlParts();
+        const { protocol, hostname, port } = kbnTestConfig.getUrlPartsWithStrippedDefaultPort();
 
         expect(resp.hits.hits[0]._source?.ruleType).eql('observability.rules.custom_threshold');
         expect(resp.hits.hits[0]._source?.alertDetailsUrl).eql(

x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/custom_threshold/group_by_fired.ts

@@ -272,7 +272,7 @@ export default function ({ getService }: DeploymentAgnosticFtrProviderContext) {
         const resp = await alertingApi.waitForDocumentInIndex<ActionDocument>({
           indexName: ALERT_ACTION_INDEX,
         });
-        const { protocol, hostname, port } = kbnTestConfig.getUrlParts();
+        const { protocol, hostname, port } = kbnTestConfig.getUrlPartsWithStrippedDefaultPort();
 
         expect(resp.hits.hits[0]._source?.ruleType).eql('observability.rules.custom_threshold');
         expect(resp.hits.hits[0]._source?.alertDetailsUrl).eql(

x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/custom_threshold/p99_pct_fired.ts

@@ -244,7 +244,7 @@ export default function ({ getService }: DeploymentAgnosticFtrProviderContext) {
           docCountTarget: 1,
         });
 
-        const { protocol, hostname, port } = kbnTestConfig.getUrlParts();
+        const { protocol, hostname, port } = kbnTestConfig.getUrlPartsWithStrippedDefaultPort();
         expect(resp.hits.hits[0]._source?.ruleType).eql('observability.rules.custom_threshold');
         expect(resp.hits.hits[0]._source?.alertDetailsUrl).eql(
           `${protocol}://${hostname}${port ? `:${port}` : ''}/app/observability/alerts/${alertId}`