fix(21066): visual bug on FluidDropdown when invalid prop is true (#21077)

* fix(21066): visual bug on FluidDropdown when invalid prop is true

* fix(21066): updated props and styles to fix invalid text and icon

* fix(21066): checking isFluid conidtion for invalidText

* fix(21066): added SCSS to fix icon position

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Co-authored-by: Heloise Lui <[email protected]>

Author: suniltc-ibm