fix: handling xml parsing not returning array for one element

[scolladon]

What does this pull request contain?

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• Added (for new features).
• Changed (for changes in existing functionality).
• Deprecated (for soon-to-be removed features).
• Removed (for now removed features).
• Fixed (for any bug fixes).
• Security (for vulnerability fixes).

Explain your changes

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Handling one parsed xml element to json resolving to object instead of array
Creating a method to deal with that aspect
Using this method in inFileHandler as well

Test has been added to cover this use case in the flowTranslationProcessor.test.js file
Tests have been added for the new asArray helper method

Does this close any currently open issues?

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closes #342

• Jest test added to check the fix is applied.

Any particular element that can be tested locally

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Any other comments

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Tested in sfdx playground

[codeclimate]

Code Climate has analyzed commit fe8a4cb and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #343 (fe8a4cb) into main (2ca036b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #343   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          730       733    +3     
=========================================
+ Hits           730       733    +3     

Impacted Files	Coverage Δ
src/post-processor/flowTranslationProcessor.js	100.00% <100.00%> (ø)
src/service/inFileHandler.js	100.00% <100.00%> (ø)
src/utils/fxpHelper.js	100.00% <100.00%> (ø)

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