Update sync_docs.yaml

[a-velasco]

A new sync_docs.yaml workflow was released in data-platform-workflows v19.2.0. It overwrites the old experimental _sync_docs.yaml workflow and releases it to the public interface.

This PR:

• Corrects the filename to match the new syntax without the experimental _ prefix.
• Removes the now unnecessary Discourse API credentials
• Adds automatic reviewers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.09%. Comparing base (0fed08b) to head (1dbf462).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #332   +/-   ##
=======================================
  Coverage   73.09%   73.09%           
=======================================
  Files           8        8           
  Lines        1286     1286           
  Branches      224      224           
=======================================
  Hits          940      940           
  Misses        267      267           
  Partials       79       79           

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[carlcsaposs-canonical]

is schedule up-to-date?