APPZ-2108 Renaming account breaks dashboards

[Gavriel-M]

This pull request addresses issues related to variable hydration and datasource selection, particularly to fix problems when renaming accounts breaks dashboards (APPZ-2108). The main changes ensure variable default values are correctly handled during rehydration, improve how variable-based datasources are recognized and mapped, and clean up unused imports.

Variable hydration improvements:

• Updated hydrateVariableDefinitionStates usage in VariableProvider.tsx to always use an empty object for initialParams during variable definition rehydration, ensuring default values are respected and preventing issues when account names change.
• Added tests in hydrationUtils.test.ts to verify that default values are used when initialValues are empty and that initial values override defaults when present.

Datasource variable selection fixes:

• Improved logic in DatasourceSelect.tsx to recognize datasource variables by checking both display names and selector names, ensuring that variable-based datasources are correctly included in the options even after renaming.
• Enhanced datasourceSelectValueToSelector in DatasourceSelect.tsx to match variables to datasource selectors using both datasource names and selector names, increasing robustness when resolving variable values to selectors.

Code cleanup:

• Removed unused parseVariables import from DatasourceSelect.tsx.

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Note

Low Risk
Scoped to UI datasource selection/variable mapping logic with no auth/data mutation; main risk is subtle mismatches in variable-to-datasource resolution affecting dashboards.

Overview
Fixes datasource-variable handling in DatasourceSelect.tsx so variable-backed datasources remain selectable/resolvable even when display names change.

Variable options are now included when the variable value matches either a datasource display name or its underlying selector.name, and datasourceSelectValueToSelector resolves variables by matching against both fields; also removes the unused parseVariables import by directly extracting the variable name from the $-prefixed value.

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