Test whether an object is a sysreqr plan
See also
Other plan:
as_data_frame(),
print.sysreqr_plan()
Examples
plan <- check_packages("xml2", platform = "ubuntu-22.04")
is_sysreqr_plan(plan)
#> [1] TRUE
is_sysreqr_plan(data.frame(x = 1))
#> [1] FALSE