AuthenticationProviders load configuration from the SQL Database on every HTTP Request

[michaelnoonan]

Performance profiling shows we are loading configuration for the authentication providers from the SQL database on every HTTP Request. It looks like the source of this behaviour is https://github.com/OctopusDeploy/OctopusDeploy/blob/master/source/Octopus.Server/Web/Api/GlobalRules/MaintenanceModeRule.cs#L32

It is only building a whitelist of URLs - we should just get the list from "loaded" providers, not necessarily enabled ones.

Relates to #3311

[michaelnoonan]

AuthenticationProviders load configuration from the SQL Database on every HTTP Request

[octoreleasebot]

Release Note: Fixed a performance issue with the maintenance mode check, in turn removing some load from the SQL Database for every HTTP request

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