feat(application): update/upgrade/downgrade/plans commands

[LorrisSaintGenez]

What

• application update --name — rename the current application
• application plans — list available self-serve plans (supports -o json)
• application upgrade / application downgrade — change the current app's self-serve plan
  • interactive picker or --plan, plus --dry-run and --accept-terms
  • both share one planchange flow and currently behave identically (no tier/direction enforcement)
  • blocks paid plans when the account has no payment method; requires ToS acceptance before applying
• Dashboard client: add UpdateApplication, GetSelfServePlans, GetUser, ChangeApplicationPlan (+ types), reusing the existing OAuth reauth-on-expiry flow

Test

• Manual: application update --name, application plans, application upgrade --dry-run, interactive upgrade/downgrade
  • You'll need to do foreman start from AlgoliaWeb develop branch

Dependencies

https://github.com/algolia/AlgoliaWeb/pull/28576 --> needs to be live

GROUT-304

[codacy-production]

Up to standards ✅

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