APPZ-2108 AccoundId based datasource - migration support

[Gavriel-M]

This pull request addresses an issue where renaming an account (datasource) could break dashboards by improving how datasource variables are resolved and matched. The changes enhance the robustness of datasource selection by ensuring that both display names and selector names are considered when resolving variables, making the component more resilient to renames.

Improvements to datasource variable resolution:

• Updated the logic for mapping variable values to datasources in DatasourceSelect to check both the display name and the selector name, ensuring that dashboards continue to function even if a datasource is renamed.
• Modified the datasourceSelectValueToSelector function to match datasource variables using both the datasource's display name and selector name, improving reliability when resolving selectors from variables.

Code cleanup:

• Removed the unused parseVariables import from DatasourceSelect.tsx.

[galangel]

Some questions that you need to be able to answer before merging:

• What happens when there are two accounts with the same name? Is it possible?
• Are you comparing case sensitive? ( regarding prev question )
• Is this a one-time pass, or every visit will require this?