Add missing secret scanning alert fields

[vandanrohatgi]

Closes #2929

• go generate
• go vet
• go test

[codecov]

Codecov Report

Merging #2930 (6e2589e) into master (fd33b81) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2930   +/-   ##
=======================================
  Coverage   98.17%   98.17%           
=======================================
  Files         143      143           
  Lines       12609    12609           
=======================================
  Hits        12379    12379           
  Misses        156      156           
  Partials       74       74           

Files Changed	Coverage Δ
github/secret_scanning.go	100.00% <ø> (ø)

[WillAbides]

LGTM. The lint failure is a timeout. I verified locally that lint passes on this branch, but somebody with permissions will need to trigger re-running the action.

[gmlewis]

Thank you, @vandanrohatgi and @WillAbides !
LGTM.
Merging.