fix: support ACCOUNT clause in RESTORE ... FROM PITR

[Torrent2002]

Summary

Closes #24545.

This PR fixes the grammar inconsistency between RESTORE ... FROM SNAPSHOT and RESTORE ... FROM PITR.

Previously, RESTORE ACCOUNT <tenant> DATABASE ... TABLE ... FROM SNAPSHOT ... was accepted, but the equivalent FROM PITR forms failed in the parser. This change adds support for the ACCOUNT clause in scoped PITR restore statements and keeps the restore privilege checks aligned with the existing snapshot behavior.

What changed

• add parser support for:
  • RESTORE ACCOUNT <acc> DATABASE <db> FROM PITR ...
  • RESTORE ACCOUNT <acc> DATABASE <db> TABLE <tbl> FROM PITR ...
• update PITR AST formatting for the new scoped account forms
• ensure scoped PITR restore only treats ACCOUNT as cross-account restore at the account restore level
• keep database/table restore validation aligned with snapshot semantics by only allowing explicit ACCOUNT when it matches the current tenant
• add parser coverage and a distributed regression case for the new syntax

Testing

• go test ./pkg/sql/parsers/dialect/mysql -run 'TestValid|TestPitrInternal' -count=1
• added distributed regression:
  • test/distributed/cases/pitr/pitr_restore_account_clause.sql

Notes

• local pkg/frontend targeted tests were not runnable in this environment because unrelated native dependencies failed to build (for example usearch.h was missing)
• distributed tests were not executed locally because the current environment does not have a runnable mo-tester setup

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