Resolve RSpec/LeakyConstantDeclaration in various specs

Arpit Tripathirequested to merge
gitlab-community/gitlab-org/gitlab:fix/rspec-leaky-constant into master

fixes #592383 (closed)

This MR resolves several `RSpec/LeakyConstantDeclaration` RuboCop offenses by ensuring that test-specific constants and classes are not defined within `RSpec.describe` or `context` blocks.

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