[FEATURE] Implement Theme Aware Component Instances for MUI/PatternFly

[jenny-s51]

Description

Certain UI components (TextInput, SearchInput) render differently for PatternFly and MUI themes.

As done in kubeflow/model-registry#993, create centralized "ThemeAware" wrapper components:

• Create ThemeAwareSearchInput #312

• ThemeAwareFormGroupWrapper: A component to consistently render form groups/elements, adapting to PatternFly's FormGroup or MUI's FormControl/TextField structures.

Refactor existing UI to use these new components.

[jenny-s51]

/assign

[jenny-s51]

/area v2

[jenny-s51]

/area frontend