[8.13](backport #38405) x-pack/filebeat/input/{cel,httpjson}: fix PEM key validation #38406
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Proposed commit message
Previously the validation was attempting to parse the PEM text as a key and was also attempting to parse the data as the wrong kind of key.
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This is an automatic backport of pull request #38405 done by [Mergify](https://mergify.com).