[TASK] Create ThemeAwareSearchInput

[jenny-s51]

Create a single search input component that internally switches between PatternFly's SearchInput and an MUI equivalent based on the active theme. See https://github.com/kubeflow/model-registry/pull/993/files#diff-087927ef0aa911db76617ac437dac6b93b2d9d5087df6b19ba24b0830334dea7

[jenny-s51]

/assign

[jenny-s51]

/area v2

[jenny-s51]

/area frontend

[ederign]

/retitle Create ThemeAwareSearchInput