Add MSD test (#153)

* Added docs for how to update the tests

* Use both cargo and bazel for tests

* run CARGO_BAZEL_REPIN

* Update registry

* Update assertion targets len

* Remove archive add network for bazel test

* Update rs/ic-observability/multiservice-discovery/README.md

Co-authored-by: sshtmc <[email protected]>

* Fixed tests to use public dashboard API

* bazel repin

* Refactor testing code and add support for main MSD bin

* Run bazel with repin

* Added removed axum dep

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Co-authored-by: sshtmc <[email protected]>
Co-authored-by: Saša Tomić <[email protected]>