Change raw statistics variable substitution format

[jtpalmer]

Description

Change the format used for variable substitution in rawstatistics.json configuration files.

This changes the syntax for variable substitution to match the format used by the ETL configuration files (as well as using the same PHP class). It also adds the other PHP constants that are not current used to the list of substitutions.

I'll update the upgrade documentation later since there will may be more changes made to the format of these files.

Motivation and Context

This is intended to make the substitutions more uniform with those used by the ETL and datawarehouse.json configuration file.

It is also a step working towards https://app.asana.com/0/342819846538629/1185671232325739/f

Tests performed

Tested manually in the job viewer.

Checklist:

• The pull request description is suitable for a Changelog entry
• The milestone is set correctly on the pull request
• The appropriate labels have been added to the pull request

[jpwhite4]

Will also need a corresponding change to the supremm stuff. Will be sufficient to switch out the:

fos_id: {
            name: "config://hierarchy.json:bottom_level_label",

in etl/js/config/supremm/etl.schema.js to:

fos_id: {
           name: "${HEIRARCHY...

or is it more complicated?

[jtpalmer]

@jpwhite4 I'm hoping that's all that will need to change, but I haven't tested it yet.