Update and use synthetic_cdisc_data(2022_02_28) in all unittest (part 2)

[shajoezhu]

Update the following test files in tests/testthat/ from synthetic_cdisc_data("2021_05_05") or others to synthetic_cdisc_data("2022_02_28")

• [x] test-tm_t_ancova.R
• [x] test-tm_t_binary_outcome.R
• [x] test-tm_t_coxreg.R
• [x] test-tm_t_events.R
• [x] test-tm_t_events_by_grade.R
• [x] test-tm_t_events_patyear.R
• [x] test-tm_t_events_summary.R
• [x] test-tm_t_exposure.R
• [x] test-tm_t_logisitic.R
• [x] test-tm_t_mult_events.R
• [x] test-tm_t_pp_medical_history.R

[edelarua]

None of the above tests use synthetic.cdisc.data

Fixed by #549