Fix regression with sse route clobbering projects

What does this MR do?

Fixes regression identified in !28689 (comment 322968886)

Related issue: #212558 (closed)

Before:

$ be rails routes | grep static_site_editor
                                      namespace_project_show_sse GET                   /*namespace_id/:project_id/-/sse/*id                                                                               projects/static_site_editor#show {:project_id=>/(?!((?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|sse|tree|update|wikis))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*)(?-mix:(?<!\.git|\.atom)))/, :id=>/[^\0]+/, :namespace_id=>/(?-mix:(?!((?i-mx:\-|\.well\-known|404\.html|422\.html|500\.html|502\.html|503\.html|abuse_reports|admin|api|apple\-touch\-icon\-precomposed\.png|apple\-touch\-icon\.png|assets|autocomplete|dashboard|deploy\.html|explore|favicon\.ico|favicon\.png|files|groups|health_check|help|import|invites|jwt|login|oauth|profile|projects|public|robots\.txt|s|search|sent_notifications|slash\-command\-logo\.png|snippets|unsubscribes|uploads|users|v2))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))(?:\/(?!(?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|sse|tree|update|wikis)\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))*/}
                           namespace_project_deprecated_show_sse GET                   /*namespace_id/:project_id/sse/*id                                                                                 projects/static_site_editor#show {:project_id=>/(?!((?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|sse|tree|update|wikis))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*)(?-mix:(?<!\.git|\.atom)))/, :id=>/[^\0]+/, :namespace_id=>/(?-mix:(?!((?i-mx:\-|\.well\-known|404\.html|422\.html|500\.html|502\.html|503\.html|abuse_reports|admin|api|apple\-touch\-icon\-precomposed\.png|apple\-touch\-icon\.png|assets|autocomplete|dashboard|deploy\.html|explore|favicon\.ico|favicon\.png|files|groups|health_check|help|import|invites|jwt|login|oauth|profile|projects|public|robots\.txt|s|search|sent_notifications|slash\-command\-logo\.png|snippets|unsubscribes|uploads|users|v2))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))(?:\/(?!(?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|sse|tree|update|wikis)\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))*/}

After:

$ be rails routes | grep static_site_editor
                                      namespace_project_show_sse GET                   /*namespace_id/:project_id/-/sse/*id(.:format)                                                                     projects/static_site_editor#show {:project_id=>/(?!((?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|tree|update|wikis))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*)(?-mix:(?<!\.git|\.atom)))/, :namespace_id=>/(?-mix:(?!((?i-mx:\-|\.well\-known|404\.html|422\.html|500\.html|502\.html|503\.html|abuse_reports|admin|api|apple\-touch\-icon\-precomposed\.png|apple\-touch\-icon\.png|assets|autocomplete|dashboard|deploy\.html|explore|favicon\.ico|favicon\.png|files|groups|health_check|help|import|invites|jwt|login|oauth|profile|projects|public|robots\.txt|s|search|sent_notifications|slash\-command\-logo\.png|snippets|unsubscribes|uploads|users|v2))\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))(?:\/(?!(?i-mx:\-|badges|blame|blob|builds|commits|create|create_dir|edit|environments\/folders|files|find_file|gitlab\-lfs\/objects|info\/lfs\/objects|new|preview|raw|refs|tree|update|wikis)\/)(?-mix:(?:[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_])(?-mix:(?<!\.git|\.atom))))*/}

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry. No changelog as fixing regression in same milestone
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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.