[chore] Simplify the OTEL setup (#4110)

# Description

This simplifies our OTEL setup by:

* Getting rid of some deprecated things.
* Using `autoexport` and letting things get configured by the `OTEL_` environment variables.
* Removing all the unnecessary config options.

## Checklist

Please put an x inside each checkbox to indicate that you've read and followed it: `[ ]` -> `[x]`

If this is a documentation change, only the first checkbox must be filled (you can delete the others if you want).

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [ ] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4110
Reviewed-by: tobi <kipvandenbos@noreply.codeberg.org>
Co-authored-by: Daenney <daenney@noreply.codeberg.org>
Co-committed-by: Daenney <daenney@noreply.codeberg.org>

vendor/go.opentelemetry.io/otel/log/provider.go

@@ -0,0 +1,37 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package log // import "go.opentelemetry.io/otel/log"
+
+import "go.opentelemetry.io/otel/log/embedded"
+
+// LoggerProvider provides access to [Logger].
+//
+// Warning: Methods may be added to this interface in minor releases. See
+// package documentation on API implementation for information on how to set
+// default behavior for unimplemented methods.
+type LoggerProvider interface {
+	// Users of the interface can ignore this. This embedded type is only used
+	// by implementations of this interface. See the "API Implementations"
+	// section of the package documentation for more information.
+	embedded.LoggerProvider
+
+	// Logger returns a new [Logger] with the provided name and configuration.
+	//
+	// The name needs to uniquely identify the source of logged code. It is
+	// recommended that name is the Go package name of the library using a log
+	// bridge (note: this is not the name of the bridge package). Most
+	// commonly, this means a bridge will need to accept this value from its
+	// users.
+	//
+	// If name is empty, implementations need to provide a default name.
+	//
+	// The version of the packages using a bridge can be critical information
+	// to include when logging. The bridge should accept this version
+	// information and use the [WithInstrumentationVersion] option to configure
+	// the Logger appropriately.
+	//
+	// Implementations of this method need to be safe for a user to call
+	// concurrently.
+	Logger(name string, options ...LoggerOption) Logger
+}