fix: misplaced commas when formatting CTAS statements

[vinothchandar]

• commas now placed after each projection field on same line
• fixed unit tests to reflect new format

Description

Fixes #3014, to place commas on the same line as the field

Testing done

Fixed unit tests and also verified on ksql commandline and confluent UI locally.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

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Appreciation of efforts,

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[hjafarpour]

LGTM.

[vinothchandar]

@hjafarpour anything else to do before you or someone else merges?

[apurvam]

@vinothchandar feel free to merge.