[pgAdmin] - RM-3936 -Feature tests patch

Hi Hackers,

Please find here attached patch for feature tests. Due to intermittent
failures on jenkins and some other system, following fixes are done(but not
limited to them only as other small fixes are also done)

- tree toggle issue
- Query tool inteliSence issue eg. when there is only one option and
drop down is not shown
- Backup and restore windows locator changes
- Fixes required due to resolving rm # 4041
- Dependent tab not showing data sometime, so refreshed the page and
handled it
- Due to change of logic for auto commit, did the required changes
- Due to fix of RM 4062, did the required workaround which broke the
test case.

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Thanks,

Usman Muzaffar
QA Team
EnterpriseDB Corporation