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Updating a Wiki page can result in a job payload exceeding the limit

When updating a wiki page, we build a payload for webhooks from the page object. The payload includes the entire content of the page, which can cause it to exceed the 5MB (compressed) limit we impose on Sidekiq jobs.

We build the content of the hook in Gitlab::HookData::WikiPageBuilderin the hash WikiPage

https://sentry.gitlab.net/gitlab/gitlabcom/issues/3372526/?referrer=gitlab_plugin

Gitlab::SidekiqMiddleware::SizeLimiter::ExceedLimitError: Integrations::ExecuteWorker job exceeds payload size limit
  lib/gitlab/application_context.rb:103:in `block in use'
    Labkit::Context.with_context(to_lazy_hash) { yield }
  lib/gitlab/application_context.rb:103:in `use'
    Labkit::Context.with_context(to_lazy_hash) { yield }
  lib/gitlab/application_context.rb:48:in `with_context'
    application_context.use(&block)
  app/models/integration.rb:580:in `async_execute'
    Integrations::ExecuteWorker.perform_async(id, data)
  app/models/project.rb:1669:in `block (2 levels) in execute_integrations'
    integration.async_execute(data)
...
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