Revert "Fix Violations of and Reenable Style/RescueModifier"

[Hamms]

Reverts #57847

The original PR failed linting during the staging build, because of some stray inline rescues in HAML code which didn't get picked up by Drone or by my local testing:

RAILS_ENV=staging RACK_ENV=staging bundle exec haml-lint dashboard pegasus shared
rake aborted!
'RAILS_ENV=staging RACK_ENV=staging bundle exec haml-lint dashboard pegasus shared' returned 65
warning: parser/current is loading parser/ruby30, which recognizes 3.0.6-compliant syntax, but you are running 3.0.5.
Please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
dashboard/app/views/layouts/application.html.haml:12 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.
dashboard/app/views/levels/_admin.html.haml:118 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.
pegasus/sites.v3/code.org/views/theme_common_head_after.haml:1 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.
pegasus/sites.v3/hourofcode.com/public/events/2013/index.haml:21 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.
pegasus/sites.v3/hourofcode.com/public/events/schools/index.haml:21 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.
pegasus/sites.v3/hourofcode.com/public/events/special/index.haml:21 [W] RuboCop: Style/RescueModifier: Avoid using `rescue` in its modifier form.

1116 files inspected, 6 lints detected
Tasks: TOP => lint => lint:all => lint:haml
(See full trace by running task with --trace)

[CDO]/lib/cdo/rake_utils.rb:81:in `system_stream_output'
[CDO]/lib/cdo/rake_utils.rb:66:in `rake_stream_output'
[CDO]/aws/ci_build:89:in `block in build'
[CDO]/aws/ci_build:65:in `chdir'
[CDO]/aws/ci_build:65:in `build'
[CDO]/aws/ci_build:112:in `block in main'
[CDO]/lib/cdo/rake_utils.rb:329:in `capture'
[CDO]/aws/ci_build:111:in `main'
[CDO]/aws/ci_build:281:in `<main>'
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[Hamms]

Merging ahead of drone to unblock staging