UI should trim whitespace from "Host" field when adding a new database

[max-rocket-internet]

Describe the bug

Whitespace is not trimmed from UI filed Host when adding a new database causing a connection error if there is a trailing space/tab.

Logs

Not required.

To Reproduce
Steps to reproduce the behavior:

Add a new database in the UI with a trailing space, like my-app.cluster-ro-xxxxxxxxxx.eu-west-1.rds.amazonaws.com

Expected behavior

UI should trim whitespace.

Information about your Metabase Installation:

You can get this information by going to Admin -> Troubleshooting.

{
  "browser-info": {
    "language": "en-GB",
    "platform": "MacIntel",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36",
    "vendor": "Google Inc."
  },
  "system-info": {
    "file.encoding": "UTF-8",
    "java.runtime.name": "OpenJDK Runtime Environment",
    "java.runtime.version": "11.0.5+10",
    "java.vendor": "AdoptOpenJDK",
    "java.vendor.url": "https://adoptopenjdk.net/",
    "java.version": "11.0.5",
    "java.vm.name": "OpenJDK 64-Bit Server VM",
    "java.vm.version": "11.0.5+10",
    "os.name": "Linux",
    "os.version": "4.14.177-139.253.amzn2.x86_64",
    "user.language": "en",
    "user.timezone": "UTC"
  },
  "metabase-info": {
    "databases": [
      "postgres",
      "mysql"
    ],
    "hosting-env": "unknown",
    "application-database": "postgres",
    "application-database-details": {
      "database": {
        "name": "PostgreSQL",
        "version": "9.6.16"
      },
      "jdbc-driver": {
        "name": "PostgreSQL JDBC Driver",
        "version": "42.2.8"
      }
    },
    "run-mode": "prod",
    "version": {
      "date": "2020-04-02",
      "tag": "v0.35.1",
      "branch": "release-0.35.x",
      "hash": "e67f169"
    },
    "settings": {
      "report-timezone": null
    }
  }
}

Severity

Minor

[flamber]

Related to #9836