Drop "unexpected glue issue" internal safety valve if there are no reports

[MichaelChirico]

lintr/R/shared_constants.R

Line 262 in 72eeefd

tryCatch(xml2lang(glue_call), error = unexpected_glue_parse_error, warning = unexpected_glue_parse_error)

Like #2474, this has caught some poor usage recently, so it's good to stay for now, but we should keep track of eventually dropping it to save maintenance overhead.

#2252 and #2448 are particularly relevant as they should be fulfilled before we consider dropping this escape.