tests: Add base-64 GPG keys to libtest declarations

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These will be useful in upcoming tests, as they are in the right format
to be substituted into a .flatpakref file.

Generated using `gpg2 --homedir test-keyring --armor --export
${FL_GPG_ID}`, then stripping the packet header and removing line
breaks.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

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