test(bigtable): switch to cmp for comparison (#4041)
test(bigtable): switch to cmp for comparison (#4041)

* fix: add Equal to BackupInfo

* switch to cmp

Co-authored-by: Christopher Wilcox <1a61e7a0041d068722f1c352424109b22f854ce0@google.com>
googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go