chore: remove unused Account#endpointConfig field

[gre]

✅ Checklist

• npx changeset was attached. (no need)
• Covered by automatic tests. this was not used, it's covered by ability to still compile our libs.
• Impact of the changes: no impact

📝 Description

the .endpointConfig on Account type is unused since around 2020, we used it in the past to workaround problem on the XRP synchronisations that had unstable backends back then and we used to have a way accessible in the UI to configure the server. it's long gone so we can remove this unused tech debt.

❓ Context

• JIRA or GitHub link: https://ledgerhq.atlassian.net/browse/LIVE-11771

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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[KVNLS]

@gre I don't know if we want to clean up in libs/ledger-live-common/src/families/ripple/api/index.ts @getServerInfo usage of endpointConfig, is it intentional to keep it?

[gre]

@KVNLS indeed the function still allows to configure the endpoint, but I did not want to be too intrusively touching the coin implementation in these sunset, only disconnecting them from the UI. because maybe @LedgerHQ/live-blockchain-support will have better ways to change this in future too (like connect it to something else like an env or a live-config dynamics')

[sprohaszka-ledger]

LGTM