UI certificate parser fails with MalformedFraming on fullchain.pem

[mkf-sysangels]

get only the first certificate in chain

fixes #3255

[TheophileDiot]

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Reviewing files that changed from the base of the PR and between 93fb95d and 3fd30ff.

📒 Files selected for processing (2)

• src/common/core/letsencrypt/ui/actions.py
• src/common/core/letsencrypt/ui/blueprints/letsencrypt.py

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