TST: series offset artithmetic tests
…racting a series of DateOffsets to / from a series of Timestamps (test_series_add_daytime_offset, test_series_add_daytime_offset)

- [x] closes #19211
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry (omitted, test only)

@dsaxton / @jbrockmendel 
Any further comments? I'm stepping away for a little while, maybe @jorisvandenbossche or @TomAugspurger can take a look. On master I see a PerformancWarning with the original example. We'll need to make sure that doesn't leak through in the tests. is this still a draft? and can you address @TomAugspurger comment, e.g. we may want to see where the PerformanceWarning are coming from can u merge master and update closing as user is ghost 