Enable SQL backups in GCP by default

[matthewfischer]

Thanks for submitting an pull request to pcf-pipelines.

To speed up the process of reviewing your pull request please provide us with:

• A short explanation of the proposed change:

Backup GCP SQL databases by default.

• An explanation of the use cases your change solves:

bbr docs explicitly call out that external DBs are not backed up, leaving a GCP deployment with no database backups until this is enabled or done manually.

• Expected result after the change:

databases are backed up,

• Current result before the change:

databases are not backed up

• Links to any other associated PRs or issues:

• I have viewed signed and have submitted the Contributor License Agreement

• I have made this pull request to the master branch

• I have run all the unit tests

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