feat: set user agent in webdav requests #4059

Job	Run time
clippy ubuntu-latest	1m 22s
coverage ubuntu-22.04 rust nightly	5m 45s
clippy macOS-latest	1m 16s
build sccache x86_64-unknown-linux-musl	3m 58s
coverage macos-13 rust nightly	5m 51s
clippy windows-latest	3m 16s
check_features (azure)	1m 0s
build sccache-dist x86_64-unknown-linux-musl	4m 38s
rustfmt ubuntu-latest	13s
check_features (gcs)	52s
build sccache aarch64-unknown-linux-musl	3m 58s
check_features (gha)	43s
build sccache armv7-unknown-linux-musleabi	3m 58s
check_features (memcached)	36s
build sccache i686-unknown-linux-musl	3m 49s
test ubuntu-20.04 rust 1.75.0	1m 44s
check_features (redis)	45s
test freebsd-14.1 rust stable (ubuntu-22.04)	5m 2s
build sccache x86_64-apple-darwin	4m 7s
test ubuntu-22.04 rust 1.75.0 dist-server	3m 16s
check_features (s3)	49s
build sccache aarch64-apple-darwin	2m 24s
test ubuntu-20.04 rust stable	1m 36s
check_features (webdav)	55s
test ubuntu-20.04 rust beta	1m 42s
toml_format	9s
test ubuntu-20.04 rust nightly	1m 44s
test ubuntu-20.04 rust stable no-default-features	2m 22s
build sccache x86_64-pc-windows-msvc	10m 18s
test ubuntu-22.04 rust stable cuda11.8	4m 39s
build sccache aarch64-pc-windows-msvc	10m 31s
test ubuntu-24.04 rust 1.75.0 cuda12.6	3m 24s
test macos-13 rust stable	2m 30s
test macos-14 rust stable	1m 27s
test windows-2019 rust 1.75.0 cuda11.8	5m 12s
test windows-2019 rust nightly cuda11.8	5m 7s
test windows-2019 rust beta cuda11.8	5m 35s
test windows-2022 rust 1.75.0 cuda12.6	5m 34s
test windows-2022 rust nightly cuda12.6	5m 47s
test windows-2022 rust beta cuda12.6	5m 39s
release	0s
	2h 13m 33s

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