refactor: simplify c8y_http_proxy #3699

Job	Run time
Approve	1s
Build aarch64-unknown-linux-musl	4m 48s
Build armv7-unknown-linux-musleabihf	5m 4s
Build arm-unknown-linux-musleabihf	5m 2s
Build arm-unknown-linux-musleabi	5m 17s
Build armv5te-unknown-linux-musleabi	4m 54s
Build x86_64-unknown-linux-musl	4m 41s
Build i686-unknown-linux-musl	4m 52s
Build riscv64gc-unknown-linux-gnu	4m 51s
Build aarch64-apple-darwin	5m 15s
Build x86_64-apple-darwin	7m 27s
check-build	1s
Test x86_64	16m 44s
Publish ${{ matrix.job.target }}	0s
Publish Containers	0s
Publish Virtual Packages	0s
release	0s
	1h 8m 57s

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