Fix etf function get_all_names_symbols

[montezdesousa]

Description

This PR fixes a bug highlighted in #2452.

Function api.etf.models.stockanalysis.get_all_names_symbols() was not retrieving the lists of symbols and names.

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[hjoaquim]

Solves the scrapping issue. Also, all tests pass.
Nicely done!

[hjoaquim]

@DidierRLopes @montezdesousa PR merged, but we still need to create an updated image, right? (Regarding #2452)