While constructing the read group from paired fastq samples,
perform a check to ensure that the id is the same for
(the first reads) in fastq_1 and fastq_2. Exit out with an
error otherwise and report the problematic sample and file paths.

No need to check for paired samples as sarek only handles paired samples

Co-authored-by: Maxime U Garcia <maxime.garcia@seqera.io>

Check if flowcell id matches for read pair should throw error when flowcell id is found (instead of not found) AND it differs for the reads.