Optimize the Dictionary view to not repeat same columns

The following discussion from !53992 (merged) should be addressed:

• @tkuah started a discussion: (+2 comments)

  Aside: This file takes a while to load on https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/development/usage_ping/dictionary.md. I wonder if this will become an issue in the future similar to #246317 (closed).

Some ideas from @a_akgun

• If find a way not to repeat field/column names (in a tabular format maybe), we could save ~200K.
• Also we may omit some repeated elements to save around 100K
• Alternatively we may switch to a plain text format