SWA integration: Honor the database name coming from SWA for Cosmos Db instead of the database property in config

[Aniruddh25]

As discussed from the SWA syncs, dab engine should honor the database name passed to the configuration endpoint from SWA -> Phoenix -> dab either as part of the connection string or a separate parameter. The database name in the runtime config should be ignored.

This is for cosmos db only.

For other databases, the connection string passed from SWA already takes precedence and the one in the runtime config is ignored. That connection string has the database name in it for all other databases.

[Aniruddh25]

The ConfigurationController accepts these parameters currently:

data-api-builder/src/Service/Controllers/ConfigurationController.cs

Line 31 in c4f7ff9

_configurationProvider.Initialize(

                configuration.Configuration,
                configuration.Schema,
                configuration.ConnectionString,
                configuration.AccessToken);

need to be modified to accept configuration.databasename

And use that over the database-specific options from the configuration.Configuration parameter.