…d state-backed defs (#26743)

## Summary & Motivation

Same as #26734 but for Looker.

## How I Tested These Changes

BK

## Changelog

[dagster-looker] `load_looker_asset_specs` and
`build_looker_pdt_assets_definitions` are updated to accept an instance
of `DagsterLookerApiTranslator` or custom subclass.

… state-backed defs (#26734)

## Summary & Motivation

Updates `load_powerbi_asset_specs()` and state-backed definitions to
accept an instance of `DagsterPowerBITranslator`.

See #26133 for more details about the motivation.

## How I Tested These Changes

BK

## Changelog

[dagster-powerbi] `load_powerbi_asset_specs` is updated to accept an
instance of `DagsterPowerBITranslator` or custom subclass.

…state-backed defs (#26740)

## Summary & Motivation

Same as #26734 but for Tableau.

## How I Tested These Changes

BK

## Changelog

[dagster-tableau] `load_tableau_asset_specs` is updated to accept an
instance of `DagsterTableauTranslator` or custom subclass.

…e-backed defs (#26799)

## Summary & Motivation

Same as #26734 but for Sigma.

## How I Tested These Changes

BK

## Changelog

[dagster-sigma] `load_sigma_asset_specs` is updated to accept an
instance of `DagsterSigmaTranslator` or custom subclass.