Fixes sync errors

[hoonji]

Motivation for features / changes

Recently merged hparam column PRs (#6732, #6733, #6736) will cause build and lint errors during 1p sync.

Technical description of changes

• import map from rxjs/operators instead of rxjs
• DataTableUtils -> dataTableUtils
• use proper string signature on CardStateMap in tests

[rileyajones]

The internal lint rules are different from the external ones and there are examples of them being mutually incompatible so we typically assume the sync will not pass lint and will merge it anyway.

[hoonji]

The internal lint rules are different from the external ones and there are examples of them being mutually incompatible so we typically assume the sync will not pass lint and will merge it anyway.

Thanks for the context, it's good to know!