Create label-external-issues.yml

[jarmak-nv]

Description

This PR adds in the external issue labeler/commenter GHA. The action is the same as in nv-morpheus/morpheus

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Merging #323 (f78d789) into branch-23.07 (4375b8a) will decrease coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-23.07     #323      +/-   ##
================================================
- Coverage         73.24%   73.20%   -0.04%     
================================================
  Files               390      390              
  Lines             13380    13380              
  Branches           1009     1009              
================================================
- Hits               9800     9795       -5     
- Misses             3580     3585       +5     

Flag	Coverage Δ
cpp	69.03% <ø> (-0.05%)	⬇️
py	42.22% <ø> (ø)

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see 4 files with indirect coverage changes

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[mdemoret-nv]

/merge