pgAdmin 4 commit: 1. Added check to skip debugger test case if the plug

1. Added check to skip debugger test case if the plugin is not installed.
2. Added code to delete the existing "pldbgapi" extension and create a new extension.
3. Updated a few test cases that are falling on specific servers.
4. Fixed test cases for pgAgent.

Fixed by: Nikhil & Yogesh

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=21333490efdf188d29c5c86c43e8a381f5369d81

Modified Files
--------------
.../server_groups/servers/pgagent/__init__.py | 2 +-
.../servers/pgagent/schedules/__init__.py | 2 +-
.../servers/pgagent/steps/__init__.py | 2 +-
.../tools/debugger/tests/debugger_test_data.json | 112 +++++++++++----------
.../tools/debugger/tests/test_close_debugger.py | 2 +-
.../tests/test_debugger_clear_all_breakpoint.py | 4 +-
.../tests/test_debugger_clear_arguments.py | 2 +-
.../tools/debugger/tests/test_debugger_direct.py | 2 +-
.../debugger/tests/test_debugger_execute_query.py | 4 +-
.../tests/test_debugger_poll_execution_result.py | 4 +-
.../debugger/tests/test_debugger_poll_result.py | 2 +-
.../debugger/tests/test_debugger_set_arguments.py | 2 +-
.../debugger/tests/test_debugger_set_breakpoint.py | 4 +-
.../debugger/tests/test_init_debugger_function.py | 2 +-
.../debugger/tests/test_init_debugger_trigger.py | 2 +-
.../tools/debugger/tests/test_init_target.py | 3 +-
.../tools/debugger/tests/test_messages_debugger.py | 2 +-
.../tools/debugger/tests/test_restart_debugger.py | 2 +-
.../tests/test_start_execution_debugger.py | 4 +-
.../debugger/tests/test_start_listener_debugger.py | 2 +-
web/pgadmin/tools/debugger/tests/utils.py | 31 +++++-
21 files changed, 110 insertions(+), 82 deletions(-)