[#2073] Refactor RepoConfigCsvParser::processLine method to avoid arrowhead style code

[georgetayqy]

Fixes #2073

Proposed commit message

The current implementation of `RepoConfigCsvParser::processLine`
contains code that has 3 levels of indentation, making it 
difficult to read and maintain.

With the proposed changes, the level of deep nesting has 
been reduced to 2 levels, making the code more 
readable and maintainable.

Let's move to refactor and clean up the code to avoid 
arrowhead-style codes for better readability and 
maintainability.

Other information

NA

[gok99]

LGTM, pretty straight-forward refactor!

[ckcherry23]

LGTM!

[MarcusTXK]

LGTM, nice job reducing the nested if blocks.

Just a minor feedback on the commit message body. The wrap is at 72 characters, so you could do it as such to reduce the number of lines:

The current implementation of `RepoConfigCsvParser::processLine` 
contains code that has 3 levels of indentation, making it difficult to 
read and maintain. 

With the proposed changes, the level of deep nesting has been reduced 
to 2 levels, making the code more readable and maintainable. 

Let's move to refactor and clean up the code to avoid arrowhead-style 
codes for better readability and maintainability.

[georgetayqy]

@MarcusTXK Thank you for the advice, I will keep that in mind in my future PRs!

[github-actions]

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