Fix multiple issues with the TSS lookup plugin when using fetch_attachments (#6720)
* Treat files as binary when downloading attachments
* Raise a warning when the attachment can't be read
* Set the 'itemValue' for files, even when they can't be read
* Always return the original secret content
* Add changelog
* Fix changelog
* Update changelog
Co-authored-by: Felix Fontein <felix@fontein.de>
* Revert "Always return the original secret content"
This reverts commit a9fb96e165.
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Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 6bff57ee6e)
Co-authored-by: laszlojau <49835454+laszlojau@users.noreply.github.com>
