feat(app_update): esp_ota_set_boot_partition_without_validate() (IDFGH-16972)

[nebkat]

Description

esp_ota_end() already performs ota_verify_partition() so there is no need for a second verification on esp_ota_set_boot_partition_without_validate().

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Checklist

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

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Note

Introduces a no-validate boot-partition setter and refactors esp_ota_set_boot_partition() to validate then delegate; updates public header/docs accordingly.

• OTA boot selection:
  • Add esp_ota_set_boot_partition_without_validate() in components/app_update/esp_ota_ops.c and declare it in include/esp_ota_ops.h.
  • Refactor esp_ota_set_boot_partition() to perform image validation then call esp_ota_set_boot_partition_without_validate().
• API docs:
  • Document new function and note equivalence of esp_ota_set_boot_partition() to esp_image_verify() + esp_ota_set_boot_partition_without_validate().

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[mahavirj]

How about using esp_ota_set_boot_partition_no_validate instead?