Cleanup removed files from RuboCop TODOs and rspec_order_todo.yml

What does this MR do and why?

This commit removes excludes from RuboCop TODOs and rspec_order_todo.yml for removed/non-existent files.

Done via https://gitlab.com/-/snippets/2482940.

Follow-up of !134648 (merged).

How to set up and validate locally

# Check diff
git diff HEAD~

# Collect files removed
git diff HEAD~ | rg -r '$1' -o '^-\s+- (\S+)' | sort | uniq

# Check if they still exist via `stat`
git diff HEAD~ | rg -r '$1' -o '^-\s+- (\S+)'  | sort | uniq | xargs stat -c "%n" {} 2>/dev/null
# No output

# Verify by touching a removed file
touch app/models/guest.rb

# Run again
git diff HEAD~ | rg -r '$1' -o '^-\s+- (\S+)'  | sort | uniq | xargs stat -c "%n" {} 2>/dev/null
app/models/guest.rb

Git stats

 .rubocop_todo/gitlab/namespaced_class.yml          |  1 -
 .../layout/first_hash_element_indentation.yml      |  1 -
 .rubocop_todo/layout/line_continuation_spacing.yml |  1 -
 .rubocop_todo/layout/line_length.yml               |  4 ---
 .rubocop_todo/lint/assignment_in_condition.yml     |  1 -
 .rubocop_todo/qa/fabricate_usage.yml               |  6 ----
 .rubocop_todo/rails/migration_timestamp.yml        |  1 -
 .rubocop_todo/rails/pluck.yml                      |  1 -
 .rubocop_todo/rspec/before_all_role_assignment.yml |  8 -----
 .rubocop_todo/rspec/context_wording.yml            |  6 ----
 .rubocop_todo/rspec/expect_change.yml              |  2 --
 .rubocop_todo/rspec/factory_bot/avoid_create.yml   |  2 --
 .rubocop_todo/rspec/feature_category.yml           | 14 ---------
 .rubocop_todo/rspec/named_subject.yml              | 11 -------
 .../rspec/repeated_example_group_body.yml          |  1 -
 .rubocop_todo/rspec/return_from_stub.yml           |  1 -
 .rubocop_todo/rspec/verified_doubles.yml           |  1 -
 .../worker_data_consistency.yml                    |  5 ----
 .rubocop_todo/style/arguments_forwarding.yml       |  1 -
 .rubocop_todo/style/explicit_block_argument.yml    |  2 --
 .rubocop_todo/style/format_string.yml              |  1 -
 .rubocop_todo/style/guard_clause.yml               |  1 -
 .rubocop_todo/style/inline_disable_annotation.yml  |  4 ---
 .rubocop_todo/style/missing_respond_to_missing.yml |  1 -
 .rubocop_todo/style/string_concatenation.yml       |  1 -
 .../style/string_literals_in_interpolation.yml     |  1 -
 spec/support/rspec_order_todo.yml                  | 35 ----------------------
 27 files changed, 114 deletions(-)