feat: set user agent in webdav requests #4074

Job	Run time
check_features (azure)	49s
clippy ubuntu-latest	1m 20s
check_features (gcs)	52s
coverage ubuntu-22.04 rust nightly	8m 5s
clippy macOS-latest	1m 9s
check_features (gha)	1m 0s
coverage macos-13 rust nightly	8m 59s
clippy windows-latest	2m 39s
build sccache x86_64-unknown-linux-musl	6m 4s
check_features (memcached)	43s
rustfmt ubuntu-latest	10s
build sccache-dist x86_64-unknown-linux-musl	4m 32s
check_features (redis)	49s
build sccache aarch64-unknown-linux-musl	6m 14s
check_features (s3)	51s
build sccache armv7-unknown-linux-musleabi	6m 0s
test ubuntu-20.04 rust 1.75.0	2m 55s
check_features (webdav)	45s
test freebsd-14.1 rust stable (ubuntu-22.04)	8m 12s
build sccache i686-unknown-linux-musl	6m 3s
test ubuntu-22.04 rust 1.75.0 dist-server	3m 37s
build sccache x86_64-apple-darwin	10m 17s
test ubuntu-20.04 rust stable	2m 45s
toml_format	9s
build sccache aarch64-apple-darwin	6m 34s
test ubuntu-20.04 rust beta	2m 47s
build sccache x86_64-pc-windows-msvc	15m 27s
test ubuntu-20.04 rust nightly	2m 37s
build sccache aarch64-pc-windows-msvc	15m 20s
test ubuntu-20.04 rust stable no-default-features	1m 56s
test ubuntu-22.04 rust stable cuda11.8	5m 29s
test ubuntu-24.04 rust 1.75.0 cuda12.6	5m 8s
test macos-13 rust stable	3m 15s
test macos-14 rust stable	3m 2s
test windows-2019 rust 1.75.0 cuda11.8	7m 41s
test windows-2019 rust nightly cuda11.8	8m 14s
test windows-2019 rust beta cuda11.8	8m 16s
test windows-2022 rust 1.75.0 cuda12.6	8m 33s
test windows-2022 rust nightly cuda12.6	8m 51s
test windows-2022 rust beta cuda12.6	8m 24s
release	0s
	3h 16m 33s

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