Revert #14234 add update error message for DB connection failures (#17612)

* Revert #14234

* Make the boot failure message more descriptive when unable to connect to DB

* Update src/Umbraco.Infrastructure/Runtime/RuntimeState.cs

Co-authored-by: Ronald Barendse <[email protected]>

* Revert changes

* Obsolete InstallMissingDatabase from V16

---------

Co-authored-by: Ronald Barendse <[email protected]>

Author: kjac

src/Umbraco.Core/Configuration/Models/GlobalSettings.cs

@@ -129,6 +129,7 @@ public string UmbracoPath
     /// <summary>
     ///     Gets or sets a value indicating whether to install the database when it is missing.
     /// </summary>
+    [Obsolete("This option will be removed in V16.")]
     [DefaultValue(StaticInstallMissingDatabase)]
     public bool InstallMissingDatabase { get; set; } = StaticInstallMissingDatabase;