fix: payment policies api routes update (EDU-19248)

[ricardoaerobr]

PR created to move the account info from the URL route to a query string position (EDU-19248).

Types of changes

• New content (endpoints, descriptions or fields from scratch)
• Improvement (make an endpoint's title or description even better)
• Spelling and grammar accuracy (self-explanatory)

Changelog

Do not forget to update your changes to our Developer Portal's changelog. Did you create a release note?

• Yes, I already created a release note about this change.
• Not yet, but I'm going to.
• No, it's just a fix.

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[github-actions]

OpenAPI Preview

Preview the changed specs:

• VTEX - Payment Policies API.json

Links point to commit 573a059. They will update on each new push to this PR.

[github-actions]

Thanks for your contribution. The .json file will be checked now with Spectral.

[PedroAntunesCosta]

The parameter/server mechanics of the fix are correct and match what the Jira ticket describes as the real API contract. However, the operation descriptions for all 5 CRUD-style endpoints still say the account is "identified by the accountName URL variable" — that variable no longer exists after this PR, so the docs would ship with a new inaccuracy of the same kind this ticket was opened to fix. That's the one blocking item; the rest are minor consistency suggestions.

[PedroAntunesCosta]

All 4 prior recommendations were fixed exactly as suggested. No new issues found in the follow-up pass.