chore(labextension): remove commented-out MUI v4 blocks

[ai-naymul]

Fixes #502.

Each of Select, SelectMulti, Input, ExperimentInput, and AdvancedSettings has a large block of the old MUI v4 makeStyles implementation commented out at the top of the file, preserved as reference when the migration to MUI v7 styled components happened. Removing them now, the live code below each block is what's actually in use.

about 530 lines across 5 files, pure deletion.

cc @jesuino @ederign @StefanoFioravanzo @ada333

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[ada333]

LGTM - but just to be safe we need to agree that this code will never be useful

[ai-naymul]

@ada333 agreed. each block is the pre-migration MUI v4 makeStyles version of the same component, and the live MUI v7 styled() code directly below each block is the replacement. the old code also imports from @material-ui/core which isn't a dependency anymore.

git history keeps the reference if anyone ever wants to look at it.

cc @jesuino @StefanoFioravanzo @ederign for a second look before merge.