[REMOVE] Remove export and help button from publication browser; fixes #1231

[lxatstariongroup]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following the COMET-IME code style guidelines
• [x] I have provided test coverage for my change (where applicable)

Description

Remove export and help button from publication browser

[sonarcloud[bot]]

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