Add custom_user_agent to connection config when connecting to MotherDuck #437

Job	Run time
file-based functional test / python 3.8	2m 38s
Buena Vista functional test / python 3.9	2m 40s
code-quality	1m 19s
file-based functional test / python 3.9	2m 38s
build packages	32s
file-based functional test / python 3.10	2m 39s
file-based functional test / python 3.11	2m 36s
fsspec test / python 3.9	1m 1s
functional test / python 3.8	2m 36s
MotherDuck functional test / python 3.9	2m 37s
functional test / python 3.9	2m 37s
plugins test / python 3.9	1m 15s
functional test / python 3.10	2m 39s
unit test / python 3.8	56s
functional test / python 3.11	2m 37s
unit test / python 3.9	57s
unit test / python 3.10	1m 1s
unit test / python 3.11	1m 2s
verify packages / python 3.8 / ubuntu-latest	34s
verify packages / python 3.9 / ubuntu-latest	31s
verify packages / python 3.10 / ubuntu-latest	36s
verify packages / python 3.11 / ubuntu-latest	31s
verify packages / python 3.8 / macos-latest	1s
verify packages / python 3.9 / macos-latest	1s
verify packages / python 3.10 / macos-latest	1s
verify packages / python 3.11 / macos-latest	1s
verify packages / python 3.8 / windows-latest	1m 27s
verify packages / python 3.9 / windows-latest	1m 46s
verify packages / python 3.10 / windows-latest	1m 41s
verify packages / python 3.11 / windows-latest	1m 43s
	43m 13s

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