URL validator tidyup; affects [discourse dynamic endpoint gerrit jira maven nexus osslifecycle python vpm website] securityheaders sonar swagger w3c (#10810)

* add a required url validator

* replace occurrences of optionalUrl.required() with url

* use standard validators in server.js

core/server/server.js

@@ -16,7 +16,12 @@ import { makeSend } from '../base-service/legacy-result-sender.js'
 import { handleRequest } from '../base-service/legacy-request-handler.js'
 import { clearResourceCache } from '../base-service/resource-cache.js'
 import { rasterRedirectUrl } from '../badge-urls/make-badge-url.js'
-import { fileSize, nonNegativeInteger } from '../../services/validators.js'
+import {
+  fileSize,
+  nonNegativeInteger,
+  optionalUrl,
+  url as requiredUrl,
+} from '../../services/validators.js'
 import log from './log.js'
 import PrometheusMetrics from './prometheus-metrics.js'
 import InfluxMetrics from './influx-metrics.js'
@@ -54,8 +59,6 @@ const Joi = originalJoi
     },
   }))
 
-const optionalUrl = Joi.string().uri({ scheme: ['http', 'https'] })
-const requiredUrl = optionalUrl.required()
 const origins = Joi.arrayFromString().items(Joi.string().origin())
 const defaultService = Joi.object({ authorizedOrigins: origins }).default({
   authorizedOrigins: [],