Bump rubocop-rails from 2.15.2 to 2.16.0 and fix issues

[americodls]

This new version of rubocop-rails contains a new cop (Rails/ActionControllerFlashBeforeRender) that will detect and fix a well-known bug as this example

This PR bumps the rubocop-rails version and fixes the other occurrences of that bug.

[codecov]

Codecov Report

Merging #3207 (4ed828c) into master (3cc8bb1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3207   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files         110      110           
  Lines        3320     3320           
=======================================
  Hits         3267     3267           
  Misses         53       53           

Impacted Files	Coverage Δ
app/controllers/api_keys_controller.rb	98.27% <100.00%> (ø)
app/controllers/multifactor_auths_controller.rb	100.00% <100.00%> (ø)
app/controllers/owners_controller.rb	98.03% <100.00%> (ø)

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[simi]

Thanks for the PR! Nice job on upstreaming the before render cop 💪.

Some of the problems are already addressed at #3204. Let's wait until that is merged and we will see how much is going to left. 🙏

[simi]

@americodls would you mind to rebase now please?

[simi]

Hmm 🤔, I still see still some unrelated changes. Would it be possible to just update rubocop-rails to 2.16.0 and fix Rails/ActionControllerFlashBeforeRender violations?

[simi]

Amazing @americodls! Thanks for your patience.