Replace config name with feature check in go/caddy conditions

[gstrauss]

Replace form.config in template conditionals
Instead, prefer to check output.protocols in template conditionals.

[gstrauss]

Aside: awselb.hbs references PolicyName: Mozilla-{{form.config}}-v5-0. Should we open a separate issue to update this? Do you happen to know what needs to happen to update the two references in that file to Mozilla-{{form.config}}-v5-7?

[janbrasna]

For a good laugh here's what worked: janbrasna@9912704 (so I may try looking into why sstls is not available on the output, rather than anything similar;D — or, ofc, exposing the version from sstls to output or via form if we want it there anyways…) — so yeah, noticed it before and tried to look for a quick fix, but will need arch decision first where else we might need it, and add it there properly.

[gstrauss]

For a good laugh here's what worked: janbrasna@9912704 (so I may try looking into why sstls is not available on the output, rather than anything similar;D — or, ofc, exposing the version from sstls to output or via form if we want it there anyways…) — so yeah, noticed it before and tried to look for a quick fix, but will need arch decision first where else we might need it, and add it there properly.

Not pretty code, but if it works, why not? Short-term, I'd prefer to simply change "5.0" to "5.7" and revisit later. Longer-term, I think I'd prefer having state.js use javascript to export a variable with the extracted value rather than the contortions in HandlebarJS templates.

In any case, awselb.hbs is not referencing {{form.config}} in a template conditional, so is not in scope for this PR. The title of this PR ("... in go/caddy conditions") also excludes awselb.

Are the proposed code changes in this PR ready for merge?