Add feature_category to source code fixture specs

What does this MR do and why?

Adds missing feature_category: RSpec metadata to frontend fixture specs for the Source Code group.

Part of #584630 (closed)

Changes

File Feature Category
spec/frontend/fixtures/blob.rb source_code_management
spec/frontend/fixtures/branches.rb source_code_management
spec/frontend/fixtures/commit.rb source_code_management
spec/frontend/fixtures/raw.rb source_code_management
spec/frontend/fixtures/snippet.rb source_code_management
spec/frontend/fixtures/tags.rb source_code_management

Feature categories based on config/feature_categories.yml and Features by Group.

🛠️ with ❤️ at Siemens

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