fix(secrets): abstract populateEvents for secret usage

[ecrupper]

add and update secrets were missing the new AllowEvents functionality. This PR addresses that.

[codecov]

Codecov Report

Attention: Patch coverage is 89.09091% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 82.08%. Comparing base (379fce6) to head (206a8ff).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
- Coverage   82.09%   82.08%   -0.01%     
==========================================
  Files         147      148       +1     
  Lines        3635     3633       -2     
==========================================
- Hits         2984     2982       -2     
  Misses        480      480              
  Partials      171      171              

Files	Coverage Δ
action/repo/add.go	94.28% <100.00%> (+3.17%)	⬆️
action/repo/update.go	100.00% <100.00%> (ø)
action/secret/add.go	83.33% <100.00%> (+0.47%)	⬆️
action/secret/update.go	83.33% <100.00%> (+0.47%)	⬆️
command/repo/add.go	93.10% <ø> (ø)
command/repo/update.go	93.10% <ø> (ø)
command/secret/add.go	75.00% <ø> (ø)
command/secret/update.go	75.00% <ø> (ø)
internal/events.go	87.75% <87.75%> (ø)

[KellyMerrick]

lgtm

[ecrupper]

Closing in favor of even further abstraction of this process here: go-vela/types#366