Convert Strings to Integer in Praefect's fallback config logic

What does this MR do?

Praefect's old configuration template automatically converted Strings to Integers. While we've documented that the integer options should be configured as Integer, the Strings have been accepted in the past as well. This became apparent as GitLab Environment Toolkit is configuring the database port as a string rather than an integer. While the issues is likely not widespread due to the documentation configuring the relevant keys as actual integers, let's handle this case to ensure the past config keeps working if this has been done.

GET has already been updated to render the database ports as strings so this change aims to mostly keep backwards compatibility with past versions of GET.

Related issues

Failing GET job: https://gitlab.com/gitlab-org/quality/gitlab-environment-toolkit-configs/quality/-/jobs/3798055299#L2668

Checklist

See Definition of done.

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Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for the GitLab Chart opened