Update SQL resource in eShop to contain secret object with necessary params

[jasonviviano]

Description

Update the resource to contain username and password, was left behind in previous PR: #284 here to speed up unblocking Bicep validation

This is pending work on the issue https://github.com/project-radius/radius/issues/3010

[shalabhms]

triage: As decided in the triage, followed with @jasonviviano. This is pending work on the issue https://github.com/project-radius/radius/issues/3010 which was tagged as "public-release". So tagging this explicitly with the public-release as well.