Add custom_user_agent to connection config when connecting to MotherDuck #441

Job	Run time
code-quality	1m 27s
functional test / python 3.8	4m 3s
functional test / python 3.9	4m 6s
build packages	15s
Buena Vista functional test / python 3.9	12m 29s
file-based functional test / python 3.8	4m 17s
functional test / python 3.10	4m 2s
file-based functional test / python 3.9	3m 54s
functional test / python 3.11	3m 33s
fsspec test / python 3.9	57s
file-based functional test / python 3.10	4m 19s
MotherDuck functional test / python 3.9	3m 5s
file-based functional test / python 3.11	3m 52s
plugins test / python 3.9	1m 6s
unit test / python 3.8	59s
unit test / python 3.9	1m 4s
unit test / python 3.10	59s
unit test / python 3.11	55s
verify packages / python 3.8 / ubuntu-latest	43s
verify packages / python 3.9 / ubuntu-latest	34s
verify packages / python 3.10 / ubuntu-latest	34s
verify packages / python 3.11 / ubuntu-latest	38s
verify packages / python 3.8 / macos-latest	1m 15s
verify packages / python 3.9 / macos-latest	1m 10s
verify packages / python 3.10 / macos-latest	50s
verify packages / python 3.11 / macos-latest	50s
verify packages / python 3.8 / windows-latest	1m 39s
verify packages / python 3.9 / windows-latest	1m 52s
verify packages / python 3.10 / windows-latest	1m 46s
verify packages / python 3.11 / windows-latest	1m 40s
	1h 8m 53s

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