Quadlet - fix trailing whitespaces handling

[ygalblum]

Remove all trailing white spaces from all lines before the line by line processing
Add test

Does this PR introduce a user-facing change?

No

None

Resolves: #21109

[ygalblum]

@edsantiago I need your help here. The issue that triggered this PR is a case of a trailing space. As part of the fix, I wrote a test unit file that includes a trailing white space. But, the basic tests are failing because of the trailing space. What should I do?

[vrothberg]

LGTM

[openshift-ci]

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[ygalblum]

@edsantiago I need your help here. The issue that triggered this PR is a case of a trailing space. As part of the fix, I wrote a test unit file that includes a trailing white space. But, the basic tests are failing because of the trailing space. What should I do?

Never mind, I've found the solution

[ygalblum]

@vrothberg I change the implementation of the method that clears trims the lines (both because it made the unit test fail and because now it's simpler and cannot return an error)

[vrothberg]

Nice, LGTM+

[rhatdan]

I was working on a different patch to throw an error in this situation. But this looks fine.
/lgtm

[edsantiago]

Belated LGTM2