chore(ci): fix docs workflow permissions

[dreamorosi]

Description of your changes

This PR adds new permissions to the rebuild_latest_docs.yml and on_doc_merge.yml to match the permissions requested by the reusable workflow called by both (reusable_publish_docs.yml).

The reusable workflow requires contents: read to be able to read the repository contents, however the two caller workflows were not specifying any content related permission at the job level, implicitly setting it to none and thus causing the workflow runs to fail (example).

With this change the workflows should be able to publish docs again.

Related issues, RFCs

Issue number: #1799

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[sonarqubecloud]

Quality Gate passed

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