test to make sure dynamic cert works trailing dot in domains

[ElvinEfendi]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #4243

Special notes for your reviewer:

[codecov-io]

Codecov Report

Merging #4249 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4249      +/-   ##
==========================================
- Coverage    57.9%   57.88%   -0.02%     
==========================================
  Files          87       87              
  Lines        6544     6544              
==========================================
- Hits         3789     3788       -1     
- Misses       2324     2326       +2     
+ Partials      431      430       -1

Impacted Files	Coverage Δ
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️

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[aledbf]

/retest

[aledbf]

@ElvinEfendi please add something like this check https://github.com/kubernetes/ingress-nginx/blob/master/test/e2e/leaks/lua_ssl.go#L101

[ElvinEfendi]

@aledbf ensureHTTPSRequest checks that already

[aledbf]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, ElvinEfendi

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• OWNERS [ElvinEfendi,aledbf]

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[ElvinEfendi]

This was not supposed to be merged, my bad for not marking it as work in progress. I will revert and continue working on this.

I was expecting the test to fail.

[ElvinEfendi]

#4274 is the actual fix.