va: Check for RIR and Perspective mismatches at runtime when they're provided

[beautifulentropy]

• Ensure the Perspective and RIR reported by each remoteVA in the *vapb.ValidationResult returned by VA.PerformValidation, matches the expected local configuration when that configuration is present.
• Correct "AfriNIC" to "AFRINIC", everywhere.

Part of #7819

[jsha]

This looks great! Looking at the "do not merge" instructions makes me think: is there a way we can land most of this code without waiting, to avoid complicated merge stacks?

For instance, the change from

Perspective string `validate:"omitempty"`

to

Perspective string `validate:"required"`

Could land right now, since we're not yet using the remoteva in prod.

In general, I think all of this PR could land right now, with the small exception of va.go:243. If we leave the va1.Perspective != "" check in place, this all becomes mergeable right away. Effectively we're saying "if the primary VA has perspective and RIR configured, it will check them against the backend values, but if they're not configured, it won't." Then after the necessary deploys happen we could remove that check (and also set the relevant fields as validate:required in the configs).

[beautifulentropy]

In general, I think all of this PR could land right now, with the small exception of va.go:243. If we leave the va1.Perspective != "" check in place, this all becomes mergeable right away.

FWIW, I think va.go:487 has the same issue as va.go:243. Similarly, while requiring Perspective for remoteva might work for now, requiring it for boulder-va wouldn't be immediately deployable. We could make it optional as well, but I’m less concerned about resolving conflicts in a couple of weeks than about splitting this into two PRs that collectively have the effect of making Perspective and RIR required in the VA.

[beautifulentropy]

Ah, missed making Perspective and RIR required in boulder-va. Adding those lines now.

This was actually correct in the original PR but it was reverted by a merge: 64a9a3a

[jsha]

Late to the party, but this looks good to me! 🎉