[openstreetmap/openstreetmap-website] Add support for OpenTelemetry reporting (PR #6405)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6405)

So I wanted to add it to the settings but the opentelemetry gems really, really don't help with that and want you to use the environment :cry: 

I did eventually manage to make it work after digging through the source to find out what the gems did with the environment variables but it wasn't pretty - there's no API call that is a direct equivalent so you wind up having to create several objects yourself and wire them together.

Much the same goes for the `-all` thing - it is possible, and it's not quite as bad and is at least documented but it's quite a bit more verbose.

In particular there's no way to enable `opentelemetry-instrumentation-rails` and have it do everything so you have to do all the subcomponents of that separately and I wound up with something like this:

```ruby
require "opentelemetry/sdk"
require "opentelemetry/instrumentation/action_mailer"
require "opentelemetry/instrumentation/action_pack"
require "opentelemetry/instrumentation/action_view"
require "opentelemetry/instrumentation/active_job"
require "opentelemetry/instrumentation/active_record"
require "opentelemetry/instrumentation/active_storage"
require "opentelemetry/instrumentation/active_support"
require "opentelemetry/instrumentation/dalli"
require "opentelemetry/instrumentation/delayed_job"
require "opentelemetry/instrumentation/faraday"
require "opentelemetry/instrumentation/pg"
require "opentelemetry/instrumentation/rack"
require "opentelemetry/instrumentation/rails"

OpenTelemetry::SDK.configure do |c|
  c.use "OpenTelemetry::Instrumentation::ActionMailer"
  c.use "OpenTelemetry::Instrumentation::ActionPack"
  c.use "OpenTelemetry::Instrumentation::ActionView"
  c.use "OpenTelemetry::Instrumentation::ActiveJob"
  c.use "OpenTelemetry::Instrumentation::ActiveRecord"
  c.use "OpenTelemetry::Instrumentation::ActiveStorage"
  c.use "OpenTelemetry::Instrumentation::ActiveSupport"
  c.use "OpenTelemetry::Instrumentation::Dalli"
  c.use "OpenTelemetry::Instrumentation::DelayedJob"
  c.use "OpenTelemetry::Instrumentation::Faraday"
  c.use "OpenTelemetry::Instrumentation::PG"
  c.use "OpenTelemetry::Instrumentation::Rack"
  c.use "OpenTelemetry::Instrumentation::Rails"
end
```

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