Revert "Use JSON-format structured logging in production (#882)"

[mwtrew]

This reverts commit e2a1252.

[github-actions]

Test coverage

91.72% line coverage reported by SimpleCov.
Run: https://github.com/RaspberryPiFoundation/editor-api/actions/runs/27762508807

[Copilot]

Pull request overview

Reverts the previously introduced JSON structured logging setup in production by removing rails_semantic_logger and related configuration, returning the app to default Rails stdout logging behavior.

Changes:

• Removed rails_semantic_logger (and semantic_logger) from the bundle.
• Deleted application/production configuration that set up JSON logging appenders and application naming.
• Adjusted Flipper initializer to no longer explicitly set config.flipper.log = false.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Gemfile.lock	Removes rails_semantic_logger and semantic_logger from resolved gems and dependencies.
Gemfile	Removes the rails_semantic_logger gem dependency.
config/initializers/flipper.rb	Stops explicitly setting Flipper logging off (now only includes a commented example).
config/environments/production.rb	Replaces JSON structured logging configuration with a standard stdout Rails logger.
config/application.rb	Removes global semantic logger configuration (JSON format + application name).

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