Use sentinel value for truncated param logging

Sean McGivernrequested to merge
use-sentinel-value-for-truncated-param-logging into master

What does this MR do?

Our Elasticsearch mapping on GitLab.com requires params to be an array of hashes, each hash with a key and value key. This does not apply to our Sidekiq arguments logging, as Sidekiq arguments can be of different types anyway, and do not have keys.

This is a follow-up to fix !25158 (merged).

See https://gitlab.com/gitlab-org/gitlab/issues/205237#note_290885684.

Edited by Sean McGivern

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