DM-53379: Add PPDB Dev Cloud SQL

[dspeck1]

Add Cloud SQL to PPDB dev project.

[JeremyMcCormick]

@dspeck1 Does the PPDB environment being set to dev in this config represent a default that is overridden for other environments when the plan is generated?

[dspeck1]

@dspeck1 Does the PPDB environment being set to dev in this config represent a default that is overridden for other environments when the plan is generated?

Thanks for catching that. The state prefix was hard coded to dev and updated to use a variable. It is fixed now.

Related to this there will be a tfvar per environment. After we get dev setup I will add tfvars files for int and prod.

[JeremyMcCormick]

@dspeck1 and I went over this and it looks good as a starting point for Cloud SQL config. This is only touching the dev environment for now; there will be subsequent PRs for int/prod.