[Improvement]: Unnecessary message related to the generated directory when using bal clean

[MaryamZi]

Description

$title.

Describe your problem(s)

ballerina: provided target directory '<PATH_TO_PROJECT>/target' does not exist.
Existing generated directory was not found

Describe your solution(s)

1. Do we really need to mention this, given the generated directory won't always be there
2. Even if we do include this, shouldn't it be consistent with the message for no target directory?

Related area

-> Other Area

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[Dilhasha]

Completed. Hence,closing.