fix(odf): preserve text after space elements

[pablopupo]

Text following <text:s/> is stored in the element's tail. _odf_text_runs() reads the space itself but not that tail, so the rest of the span is lost.

Use text_recursive for <text:s> and add an ODT regression test for the reported structure.

Issue resolved by this Pull Request:
Resolves #3847

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[dolfim-ibm]

@pablopupo I think your PR is solving the same issue of #3850.

[pablopupo]

Yes, #3850 covers this case and the broader inline-tail path. I missed it before opening this draft. I'll close this PR in favor of #3850.