[FIX] base: do not insert duplicated translations

This will avoid unique constrain to be raised in the scenario of a record having
multiple ir.model.data entries to the same record.

This can be reproduced in standard with the following scenario

1. The product.template product_product_4_product_template has multiple variants
   product_product_4
   product_product_4b
   product_product_4c
   ...

2. At the creation of the records, ir.model.data are automatically created
   product_product_4_product_template
   product_product_4b_product_template
   product_product_4c_product_template
   ...

   While this could/should be fixed too. Having several ir.model.data to the
   same record is not forbidden and could be reproduced in different ways.

3. Export the translations
   #. module: product
   #: model:product.product,description_sale:product.product_product_4
   #: model:product.product,description_sale:product.product_product_4b
   #: model:product.product,description_sale:product.product_product_4c
   #: model:product.template,description_sale:product.product_product_4_product_template
   #: model:product.template,description_sale:product.product_product_4b_product_template
   #: model:product.template,description_sale:product.product_product_4c_product_template
   msgid ""
   ...

   As the field description_sale is present on both model and is translatable

4. Load a .po file with these translations
   The 3 product.template entries points to the same record, making the unique
   constrain raise an error

This error can also be reproduced with the project_time_mode_id_duplicate_xmlid
field creating two xmlid for the same ir.model.fields

Closes #21472

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